vtysh: Crash during show running-config #6101
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RCA: when client is killed, show running-config command crashes vtysh. vtysh_client_config function temporarily makes vty->of which is standard output file pointer to null inorder to suppress output to user. This call further tries to communicate with each client and when the client is terminated, socket call fails and hits the exception path to print the connection has failed using vty_out. vty_out crashes because vtysh_client_config has temporarily made vty->of pointer to NULL to supress o/p to user. Fix: vty_out function should check for the sanity of vty->of pointer. If it doesn't exist, this must have hit exception path, so use the vty->saved_of if exists. Signed-off-by: Saravanan K <saravanank@vmware.com>
💚 Basic BGPD CI results: SUCCESS, 0 tests failedResults table
For details, please contact louberger |
Continuous Integration Result: SUCCESSFULCongratulations, this patch passed basic tests Tested-by: NetDEF / OpenSourceRouting.org CI System CI System Testrun URL: https://ci1.netdef.org/browse/FRR-FRRPULLREQ-11475/ This is a comment from an automated CI system. Warnings Generated during build:Debian 10 amd64 build: Successful with additional warningsDebian Package lintian failed for Debian 10 amd64 build: |
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RCA:
when client is killed, show running-config command crashes vtysh.
vtysh_client_config function temporarily makes vty->of which is standard output file
pointer to null inorder to suppress output to user.
This call further tries to communicate with each client and when the client
is terminated, socket call fails and hits the exception path to print the
connection has failed using vty_out.
vty_out crashes because vtysh_client_config has temporarily made vty->of
pointer to NULL to supress o/p to user.
Fix:
vty_out function should check for the sanity of vty->of pointer.
If it doesn't exist, this must have hit exception path, so use the
vty->saved_of if exists.
Signed-off-by: Saravanan K saravanank@vmware.com