[201811][dhcp6relay] a couple memory access protections#9861
Merged
kellyyeh merged 2 commits intosonic-net:201811from Jan 28, 2022
Merged
[201811][dhcp6relay] a couple memory access protections#9861kellyyeh merged 2 commits intosonic-net:201811from
kellyyeh merged 2 commits intosonic-net:201811from
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yxieca
approved these changes
Jan 27, 2022
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This is a cherry-pick of PR #9851
Why I did it
the strcpy and buffer allocation is not safe, it corrupts 1 byte on the stack. Depending on the memory layout, it may or may not cause issue immediately.
message type is not validated before updating the counter. Which could cause segment fault.
How I did it
Remove the unsafe strcpy, use config->interface.c_str() instead.
Check message type before updating counters.
How to verify it
The issue (1) caused segment fault on a specific platform. The fix was validated there. Issue (2) was precautionary. Added log in case it triggers.
Which release branch to backport (provide reason below if selected)
Description for the changelog
A picture of a cute animal (not mandatory but encouraged)