#7990 closed defect (fixed)
undefined-behavior at libavcodec/snowenc.c and division by zero at libavcodec/ratecontrol.c
| Reported by: | Suhwan | Owned by: | |
|---|---|---|---|
| Priority: | normal | Component: | undetermined |
| Version: | unspecified | Keywords: | ubsan snowenc ratecontrol |
| Cc: | Blocked By: | ||
| Blocking: | Reproduced by developer: | no | |
| Analyzed by developer: | no |
Description
Summary of the bug:
There're undefined-behavior at libavcodec/snowenc.c and division by zero at libavcodec/ratecontrol.c.
How to reproduce:
% ffmpeg_g -y -r 51 -i tmp.avi -map 0 -c:v snow -c:v:82 sgi -disposition:a msvideo1 -disposition:s:13 g726 -r 2 -ab 841k -ar 22050 -ac 5 -strict 1 tmp_.adx ffmpeg version : N-94163-g664a27ea40 built with clang version 9.0.0
Patches should be submitted to the ffmpeg-devel mailing list and not this bug tracker.
Attachments (2)
Change History (5)
by , 5 years ago
by , 5 years ago
| Attachment: | gdb_log_7990 added |
|---|
comment:1 by , 4 years ago
| Resolution: | → fixed |
|---|---|
| Status: | new → closed |
comment:2 by , 4 years ago
I will post a patch to ffmpeg-devel to avoid the floating point division.
comment:3 by , 4 years ago
No floating point division by 0 is reproduceable anymore since a long time
The floating point division was fixed already in 55279d699fa64d8eb1185d8db04ab4ed92e8dea2
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The 2 undefined shifts in snowenc where fixed in 8802e329c8317ca5ceb929df48a23eb0f9e852b2
The division by 0 in ratecontrol is not an integer division so its not a bug as such