[201811][dhcp6relay] a couple memory access protections #9861
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
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)