mvcdec: Heap overflow in 'ih264d_read_coeff4x4_cabac' #98
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
In some erroneous fuzzer bistreams, the slice data requires more parsing than what was implied by the distance between successive start codes. The primary culprit is the NEXTBITS macro which requires reading 4 additional bytes of the bitstream buffer. To alleviate this, 4 bytes per 4x4 TU have been additionally allocated to the bitstream buffer. Bug = ossfuzz:66989 Test: mvc_dec_fuzzer
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Outdated suggestions cannot be applied.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.
In some erroneous fuzzer bistreams, the slice data requires more parsing than what was implied by the distance between successive start codes. The primary culprit is the NEXTBITS macro which requires reading 4 additional bytes of the bitstream buffer. To alleviate this, 4 bytes per 4x4 TU have been additionally allocated to the bitstream buffer.
Bug = ossfuzz:66989
Test: mvc_dec_fuzzer