1230276 - FFMPEG: index out of bounds in [@prefetch_motion]

Status: RESOLVED FIXED

(Core :: Audio/Video: Playback, defect)

Description

[Tyson Smith [:tsmith]]

Attachment: call_stack.txt

Found fuzzing ffmpeg commit: 259c71c199e9b4ea89bf4cb90ed0e207ddc9dff7

This is an Undefined behavior sanitizer (UBSan) runtime error.

libavcodec/h264_mb.c:493:25: runtime error: index 63 out of bounds for type 'H264Ref [48]'

Run this command with an UBSan build:
$ ./ffmpeg -v 0 -nostats -f h264 -i test_case.264 -f null -

Comment 1

[Tyson Smith [:tsmith]]

Attachment: test_case.264

Comment 2

[Michael Niedermayer [:mn]]

Fixed in c8ea57664fe3ad611c9ecd234670544ddff7ca55

Comment 3

[Tyson Smith [:tsmith]]

Thanks Michael.

Comment 4

[Tyson Smith [:tsmith]]

Oops I guess I shouldn't clear the sec flag without asking first.