Fix problem with the negation in TextView/libswoc #10971
Merged
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
|
This is needed for the problem found in oss fuzz - https://oss-fuzz.com/testcase-detail/5196561539530752 |
|
/src/trafficserver/lib/swoc/src/TextView.cc:66:16: runtime error: negation of -9223372036854775808 cannot be represented in type 'intmax_t' (aka 'long'); cast to an unsigned type to negate this value to itself |
bneradt
reviewed
Jan 8, 2024
There was a problem hiding this comment.
Ideally we would add a unit test for this, but I guess our copied libswoc doesn't have that.
Can you make a libswoc PR for this change and add a unit test here:
https://github.com/SolidWallOfCode/libswoc/blob/master/unit_tests/test_TextView.cc#L453
|
Created SolidWallOfCode/libswoc#92 |
phongn
pushed a commit
to phongn/trafficserver
that referenced
this pull request
Feb 1, 2024
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Outdated suggestions cannot be applied.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.
ABS_MIN is 9223372036854775808
intmax_t(ABS_MIN) is -9223372036854775808
negation of that is overflow for intmax_t data type with max value of 9223372036854775807
And I think that's not the intention as well.
So I need to make this change.