Correct the used of snprintf in owinterface_add #51
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jserv
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jserv
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Nov 30, 2023
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The origin size value of snprintf in owinterface_add was ETH_ALEN, if the string size is too large, it will only allow ETH_ALEN - 1 characters to be copied into the buffer. However, the buffer starts from location inf_name + 1 and the last character must be '\0', which means that the buffer only has at most ETH_ALEN - 2 characters space left. So the size value in snprintf of owinterface_add should be ETH_ALEN - 1
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I've made some modification to my commit message, please take a look when you have available time. |
rickywu0421
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Thank @vax-r for contributing! |
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The origin
sizevalue insnprintfofowinterface_addwasETH_ALEN, which will only allow ETH_ALEN - 1 characters to write in the buffer when string size is too long.However, since the buffer starts from
inf_name + 1, which only allowETH_ALEN - 1characters to be written into, plus the last character must be'\0', so we should only allowETH_ALEN - 2character to be written into the buffer.That's why I create the PR and fix the
sizevalue toETH_ALEN - 1