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Remove unsafe code from SmtpReplyReaderFactory.ProcessRead (#121297)
The `ProcessRead` method used unnecessary unsafe pointer arithmetic despite accepting a `ReadOnlySpan<byte>` parameter that already provides safe, efficient indexing. ## Changes - **Replaced unsafe pointer arithmetic with ReadOnlySpan indexing** - Removed `unsafe` block and `fixed` statement - Replaced `byte*` pointers with integer index tracking - Changed `*ptr++` to `buffer[i++]`, `(int)(ptr - start)` to `i` - **Fixed pre-existing validation bug** (discovered during refactoring) - Changed `if (b < '0' && b > '9')` to `if (b < '0' || b > '9')` in digit validation - Original condition could never be true (no byte can be both < 48 and > 57) ## Before/After ```csharp // Before unsafe { fixed (byte* pBuffer = buffer) { byte* ptr = pBuffer; byte b = *ptr++; if (b < '0' && b > '9') // Bug: never true throw new FormatException(...); } } // After int i = 0; byte b = buffer[i++]; if (b < '0' || b > '9') // Correct validation throw new FormatException(...); ``` All existing tests pass. No API or behavior changes. > [!WARNING] > > <details> > <summary>Firewall rules blocked me from connecting to one or more addresses (expand for details)</summary> > > #### I tried to connect to the following addresses, but was blocked by firewall rules: > > - `1d7b368770e34adf874f9425defe0a54` > - Triggering command: `/home/REDACTED/work/runtime/runtime/artifacts/bin/testhost/net10.0-linux-Debug-x64/dotnet exec --runtimeconfig System.Net.Mail.Functional.Tests.runtimeconfig.json --depsfile System.Net.Mail.Functional.Tests.deps.json /home/REDACTED/.nuget/packages/microsoft.dotnet.xunitconsoleREDACTED/2.9.3-beta.25528.108/build/../tools/net/xunit.console.dll System.Net.Mail.Functional.Tests.dll -xml testResults.xml -nologo -notrait category=OuterLoop -notrait category=failing` (dns block) > - `2f1ac5ebdede409c885709296cd79caf` > - Triggering command: `/home/REDACTED/work/runtime/runtime/artifacts/bin/testhost/net10.0-linux-Debug-x64/dotnet exec --runtimeconfig System.Net.Mail.Functional.Tests.runtimeconfig.json --depsfile System.Net.Mail.Functional.Tests.deps.json /home/REDACTED/.nuget/packages/microsoft.dotnet.xunitconsoleREDACTED/2.9.3-beta.25528.108/build/../tools/net/xunit.console.dll System.Net.Mail.Functional.Tests.dll -xml testResults.xml -nologo -notrait category=OuterLoop -notrait category=failing` (dns block) > - `3e267405dc55499fbf89ba600b269486` > - Triggering command: `/home/REDACTED/work/runtime/runtime/artifacts/bin/testhost/net10.0-linux-Debug-x64/dotnet exec --runtimeconfig System.Net.Mail.Functional.Tests.runtimeconfig.json --depsfile System.Net.Mail.Functional.Tests.deps.json /home/REDACTED/.nuget/packages/microsoft.dotnet.xunitconsoleREDACTED/2.9.3-beta.25528.108/build/../tools/net/xunit.console.dll System.Net.Mail.Functional.Tests.dll -xml testResults.xml -nologo -notrait category=OuterLoop -notrait category=failing` (dns block) > - `4741d8119c5b46deb7b6a3247cf3e987` > - Triggering command: `/home/REDACTED/work/runtime/runtime/artifacts/bin/testhost/net10.0-linux-Debug-x64/dotnet exec --runtimeconfig System.Net.Mail.Functional.Tests.runtimeconfig.json --depsfile System.Net.Mail.Functional.Tests.deps.json /home/REDACTED/.nuget/packages/microsoft.dotnet.xunitconsoleREDACTED/2.9.3-beta.25528.108/build/../tools/net/xunit.console.dll System.Net.Mail.Functional.Tests.dll -xml testResults.xml -nologo -notrait category=OuterLoop -notrait category=failing` (dns block) > - `4777e169b2a54bef872d3013b91d119d` > - Triggering command: `/home/REDACTED/work/runtime/runtime/artifacts/bin/testhost/net10.0-linux-Debug-x64/dotnet exec --runtimeconfig System.Net.Mail.Functional.Tests.runtimeconfig.json --depsfile System.Net.Mail.Functional.Tests.deps.json /home/REDACTED/.nuget/packages/microsoft.dotnet.xunitconsoleREDACTED/2.9.3-beta.25528.108/build/../tools/net/xunit.console.dll System.Net.Mail.Functional.Tests.dll -xml testResults.xml -nologo -notrait category=OuterLoop -notrait category=failing` (dns block) > - `674cfdb34af049bc80dcbc8c430c56e8` > - Triggering command: `/home/REDACTED/work/runtime/runtime/artifacts/bin/testhost/net10.0-linux-Debug-x64/dotnet exec --runtimeconfig System.Net.Mail.Functional.Tests.runtimeconfig.json --depsfile System.Net.Mail.Functional.Tests.deps.json /home/REDACTED/.nuget/packages/microsoft.dotnet.xunitconsoleREDACTED/2.9.3-beta.25528.108/build/../tools/net/xunit.console.dll System.Net.Mail.Functional.Tests.dll -xml testResults.xml -nologo -notrait category=OuterLoop -notrait category=failing` (dns block) > - `83b38af9921845538f0d2b8e91bd4c93` > - Triggering command: `/home/REDACTED/work/runtime/runtime/artifacts/bin/testhost/net10.0-linux-Debug-x64/dotnet exec --runtimeconfig System.Net.Mail.Functional.Tests.runtimeconfig.json --depsfile System.Net.Mail.Functional.Tests.deps.json /home/REDACTED/.nuget/packages/microsoft.dotnet.xunitconsoleREDACTED/2.9.3-beta.25528.108/build/../tools/net/xunit.console.dll System.Net.Mail.Functional.Tests.dll -xml testResults.xml -nologo -notrait category=OuterLoop -notrait category=failing` (dns block) > - `8445b7f8594e4fa79d67a5f60e1917e1` > - Triggering command: `/home/REDACTED/work/runtime/runtime/artifacts/bin/testhost/net10.0-linux-Debug-x64/dotnet exec --runtimeconfig System.Net.Mail.Functional.Tests.runtimeconfig.json --depsfile System.Net.Mail.Functional.Tests.deps.json /home/REDACTED/.nuget/packages/microsoft.dotnet.xunitconsoleREDACTED/2.9.3-beta.25528.108/build/../tools/net/xunit.console.dll System.Net.Mail.Functional.Tests.dll -xml testResults.xml -nologo -notrait category=OuterLoop -notrait category=failing` (dns block) > - `9c17f6fe624d4688a482d039f62e9376` > - Triggering command: `/home/REDACTED/work/runtime/runtime/artifacts/bin/testhost/net10.0-linux-Debug-x64/dotnet exec --runtimeconfig System.Net.Mail.Functional.Tests.runtimeconfig.json --depsfile System.Net.Mail.Functional.Tests.deps.json /home/REDACTED/.nuget/packages/microsoft.dotnet.xunitconsoleREDACTED/2.9.3-beta.25528.108/build/../tools/net/xunit.console.dll System.Net.Mail.Functional.Tests.dll -xml testResults.xml -nologo -notrait category=OuterLoop -notrait category=failing` (dns block) > - `9caf23efb9b44deeaad1f5a4390857ed` > - Triggering command: `/home/REDACTED/work/runtime/runtime/artifacts/bin/testhost/net10.0-linux-Debug-x64/dotnet exec --runtimeconfig System.Net.Mail.Functional.Tests.runtimeconfig.json --depsfile System.Net.Mail.Functional.Tests.deps.json /home/REDACTED/.nuget/packages/microsoft.dotnet.xunitconsoleREDACTED/2.9.3-beta.25528.108/build/../tools/net/xunit.console.dll System.Net.Mail.Functional.Tests.dll -xml testResults.xml -nologo -notrait category=OuterLoop -notrait category=failing` (dns block) > - `ad5b1d9a0284470497198faf9964749f` > - Triggering command: `/home/REDACTED/work/runtime/runtime/artifacts/bin/testhost/net10.0-linux-Debug-x64/dotnet exec --runtimeconfig System.Net.Mail.Functional.Tests.runtimeconfig.json --depsfile System.Net.Mail.Functional.Tests.deps.json /home/REDACTED/.nuget/packages/microsoft.dotnet.xunitconsoleREDACTED/2.9.3-beta.25528.108/build/../tools/net/xunit.console.dll System.Net.Mail.Functional.Tests.dll -xml testResults.xml -nologo -notrait category=OuterLoop -notrait category=failing` (dns block) > - `dad9f17011b54a2883ca8f7489dde4e8` > - Triggering command: `/home/REDACTED/work/runtime/runtime/artifacts/bin/testhost/net10.0-linux-Debug-x64/dotnet exec --runtimeconfig System.Net.Mail.Functional.Tests.runtimeconfig.json --depsfile System.Net.Mail.Functional.Tests.deps.json /home/REDACTED/.nuget/packages/microsoft.dotnet.xunitconsoleREDACTED/2.9.3-beta.25528.108/build/../tools/net/xunit.console.dll System.Net.Mail.Functional.Tests.dll -xml testResults.xml -nologo -notrait category=OuterLoop -notrait category=failing` (dns block) > - `dc00558270b44330978820a282438ebc` > - Triggering command: `/home/REDACTED/work/runtime/runtime/artifacts/bin/testhost/net10.0-linux-Debug-x64/dotnet exec --runtimeconfig System.Net.Mail.Functional.Tests.runtimeconfig.json --depsfile System.Net.Mail.Functional.Tests.deps.json /home/REDACTED/.nuget/packages/microsoft.dotnet.xunitconsoleREDACTED/2.9.3-beta.25528.108/build/../tools/net/xunit.console.dll System.Net.Mail.Functional.Tests.dll -xml testResults.xml -nologo -notrait category=OuterLoop -notrait category=failing` (dns block) > - `f13d3b87148d4771ab29f5a3afc20964` > - Triggering command: `/home/REDACTED/work/runtime/runtime/artifacts/bin/testhost/net10.0-linux-Debug-x64/dotnet exec --runtimeconfig System.Net.Mail.Functional.Tests.runtimeconfig.json --depsfile System.Net.Mail.Functional.Tests.deps.json /home/REDACTED/.nuget/packages/microsoft.dotnet.xunitconsoleREDACTED/2.9.3-beta.25528.108/build/../tools/net/xunit.console.dll System.Net.Mail.Functional.Tests.dll -xml testResults.xml -nologo -notrait category=OuterLoop -notrait category=failing` (dns block) > - `f4e51707a3454d68a871b21a5edce6f6` > - Triggering command: `/home/REDACTED/work/runtime/runtime/artifacts/bin/testhost/net10.0-linux-Debug-x64/dotnet exec --runtimeconfig System.Net.Mail.Functional.Tests.runtimeconfig.json --depsfile System.Net.Mail.Functional.Tests.deps.json /home/REDACTED/.nuget/packages/microsoft.dotnet.xunitconsoleREDACTED/2.9.3-beta.25528.108/build/../tools/net/xunit.console.dll System.Net.Mail.Functional.Tests.dll -xml testResults.xml -nologo -notrait category=OuterLoop -notrait category=failing` (dns block) > > If you need me to access, download, or install something from one of these locations, you can either: > > - Configure [Actions setup steps](https://gh.io/copilot/actions-setup-steps) to set up my environment, which run before the firewall is enabled > - Add the appropriate URLs or hosts to the custom allowlist in this repository's [Copilot coding agent settings](https://github.com/dotnet/runtime/settings/copilot/coding_agent) (admins only) > > </details> <!-- START COPILOT CODING AGENT SUFFIX --> <details> <summary>Original prompt</summary> > There is absolutely unnecessary unsafe code in `SmtpReplyReaderFactory.cs` in `ProcessRead` function, please file a PR to replace with just normal ReadOnlySpan memory access to make it memory safe. </details> <!-- START COPILOT CODING AGENT TIPS --> --- 💬 We'd love your input! Share your thoughts on Copilot coding agent in our [2 minute survey](https://gh.io/copilot-coding-agent-survey). --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: EgorBo <523221+EgorBo@users.noreply.github.com> Co-authored-by: Egor Bogatov <egorbo@gmail.com> Co-authored-by: xtqqczze <45661989+xtqqczze@users.noreply.github.com>
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‎src/libraries/System.Net.Mail/src/System/Net/Mail/SmtpReplyReaderFactory.cs‎

Lines changed: 116 additions & 124 deletions
Original file line numberDiff line numberDiff line change
@@ -88,153 +88,145 @@ private int ProcessRead(ReadOnlySpan<byte> buffer, bool readLine)
8888
throw new IOException(SR.Format(SR.net_io_readfailure, SR.net_io_connectionclosed));
8989
}
9090

91-
unsafe
91+
int i = 0;
92+
int length = buffer.Length;
93+
94+
switch (_readState)
9295
{
93-
fixed (byte* pBuffer = buffer)
94-
{
95-
byte* start = pBuffer;
96-
byte* ptr = start;
97-
byte* end = ptr + buffer.Length;
96+
case ReadState.Status0:
97+
{
98+
if (i < length)
99+
{
100+
byte b = buffer[i++];
101+
if (!char.IsAsciiDigit((char)b))
102+
{
103+
throw new FormatException(SR.SmtpInvalidResponse);
104+
}
105+
106+
_statusCode = (SmtpStatusCode)(100 * (b - '0'));
98107

99-
switch (_readState)
108+
goto case ReadState.Status1;
109+
}
110+
_readState = ReadState.Status0;
111+
break;
112+
}
113+
case ReadState.Status1:
100114
{
101-
case ReadState.Status0:
115+
if (i < length)
116+
{
117+
byte b = buffer[i++];
118+
if (!char.IsAsciiDigit((char)b))
102119
{
103-
if (ptr < end)
104-
{
105-
byte b = *ptr++;
106-
if (b < '0' && b > '9')
107-
{
108-
throw new FormatException(SR.SmtpInvalidResponse);
109-
}
110-
111-
_statusCode = (SmtpStatusCode)(100 * (b - '0'));
112-
113-
goto case ReadState.Status1;
114-
}
115-
_readState = ReadState.Status0;
116-
break;
120+
throw new FormatException(SR.SmtpInvalidResponse);
117121
}
118-
case ReadState.Status1:
122+
123+
_statusCode += 10 * (b - '0');
124+
125+
goto case ReadState.Status2;
126+
}
127+
_readState = ReadState.Status1;
128+
break;
129+
}
130+
case ReadState.Status2:
131+
{
132+
if (i < length)
133+
{
134+
byte b = buffer[i++];
135+
if (!char.IsAsciiDigit((char)b))
136+
{
137+
throw new FormatException(SR.SmtpInvalidResponse);
138+
}
139+
140+
_statusCode += b - '0';
141+
142+
goto case ReadState.ContinueFlag;
143+
}
144+
_readState = ReadState.Status2;
145+
break;
146+
}
147+
case ReadState.ContinueFlag:
148+
{
149+
if (i < length)
150+
{
151+
byte b = buffer[i++];
152+
if (b == ' ') // last line
119153
{
120-
if (ptr < end)
121-
{
122-
byte b = *ptr++;
123-
if (b < '0' && b > '9')
124-
{
125-
throw new FormatException(SR.SmtpInvalidResponse);
126-
}
127-
128-
_statusCode += 10 * (b - '0');
129-
130-
goto case ReadState.Status2;
131-
}
132-
_readState = ReadState.Status1;
133-
break;
154+
goto case ReadState.LastCR;
134155
}
135-
case ReadState.Status2:
156+
else if (b == '-') // more lines coming
136157
{
137-
if (ptr < end)
138-
{
139-
byte b = *ptr++;
140-
if (b < '0' && b > '9')
141-
{
142-
throw new FormatException(SR.SmtpInvalidResponse);
143-
}
144-
145-
_statusCode += b - '0';
146-
147-
goto case ReadState.ContinueFlag;
148-
}
149-
_readState = ReadState.Status2;
150-
break;
158+
goto case ReadState.ContinueCR;
151159
}
152-
case ReadState.ContinueFlag:
160+
else // error
153161
{
154-
if (ptr < end)
155-
{
156-
byte b = *ptr++;
157-
if (b == ' ') // last line
158-
{
159-
goto case ReadState.LastCR;
160-
}
161-
else if (b == '-') // more lines coming
162-
{
163-
goto case ReadState.ContinueCR;
164-
}
165-
else // error
166-
{
167-
throw new FormatException(SR.SmtpInvalidResponse);
168-
}
169-
}
170-
_readState = ReadState.ContinueFlag;
171-
break;
162+
throw new FormatException(SR.SmtpInvalidResponse);
172163
}
173-
case ReadState.ContinueCR:
164+
}
165+
_readState = ReadState.ContinueFlag;
166+
break;
167+
}
168+
case ReadState.ContinueCR:
169+
{
170+
while (i < length)
171+
{
172+
if (buffer[i++] == '\r')
174173
{
175-
while (ptr < end)
176-
{
177-
if (*ptr++ == '\r')
178-
{
179-
goto case ReadState.ContinueLF;
180-
}
181-
}
182-
_readState = ReadState.ContinueCR;
183-
break;
174+
goto case ReadState.ContinueLF;
184175
}
185-
case ReadState.ContinueLF:
176+
}
177+
_readState = ReadState.ContinueCR;
178+
break;
179+
}
180+
case ReadState.ContinueLF:
181+
{
182+
if (i < length)
183+
{
184+
if (buffer[i++] != '\n')
186185
{
187-
if (ptr < end)
188-
{
189-
if (*ptr++ != '\n')
190-
{
191-
throw new FormatException(SR.SmtpInvalidResponse);
192-
}
193-
if (readLine)
194-
{
195-
_readState = ReadState.Status0;
196-
return (int)(ptr - start);
197-
}
198-
goto case ReadState.Status0;
199-
}
200-
_readState = ReadState.ContinueLF;
201-
break;
186+
throw new FormatException(SR.SmtpInvalidResponse);
202187
}
203-
case ReadState.LastCR:
188+
if (readLine)
204189
{
205-
while (ptr < end)
206-
{
207-
if (*ptr++ == '\r')
208-
{
209-
goto case ReadState.LastLF;
210-
}
211-
}
212-
_readState = ReadState.LastCR;
213-
break;
190+
_readState = ReadState.Status0;
191+
return i;
214192
}
215-
case ReadState.LastLF:
193+
goto case ReadState.Status0;
194+
}
195+
_readState = ReadState.ContinueLF;
196+
break;
197+
}
198+
case ReadState.LastCR:
199+
{
200+
while (i < length)
201+
{
202+
if (buffer[i++] == '\r')
216203
{
217-
if (ptr < end)
218-
{
219-
if (*ptr++ != '\n')
220-
{
221-
throw new FormatException(SR.SmtpInvalidResponse);
222-
}
223-
goto case ReadState.Done;
224-
}
225-
_readState = ReadState.LastLF;
226-
break;
204+
goto case ReadState.LastLF;
227205
}
228-
case ReadState.Done:
206+
}
207+
_readState = ReadState.LastCR;
208+
break;
209+
}
210+
case ReadState.LastLF:
211+
{
212+
if (i < length)
213+
{
214+
if (buffer[i++] != '\n')
229215
{
230-
int actual = (int)(ptr - start);
231-
_readState = ReadState.Done;
232-
return actual;
216+
throw new FormatException(SR.SmtpInvalidResponse);
233217
}
218+
goto case ReadState.Done;
219+
}
220+
_readState = ReadState.LastLF;
221+
break;
222+
}
223+
case ReadState.Done:
224+
{
225+
_readState = ReadState.Done;
226+
return i;
234227
}
235-
return (int)(ptr - start);
236-
}
237228
}
229+
return i;
238230
}
239231

240232
internal int Read(SmtpReplyReader caller, Span<byte> buffer)

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