#6763: swscale: Out-of-bounds memory accesses
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Reporter: Gramner | Owner: (none)
Type: defect | Status: new
Priority: important | Component: swscale
Version: git-master | Resolution:
Keywords: crash | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by Niklas Haas):
It's worth pointing out that these alignment requirements are actually
explicitly mentioned, albeit in the documentation for AVFrame:
https://ffmpeg.org/doxygen/2.7/frame_8h_source.html#l00191
Admittedly, this is a very non-obvious place, and also doesn't extend to
`sws_scale()`.
After investigating the situation more closely, I have come to notice that
practically none of the asm routines are designed to handle images whose
stride is not a multiple of at least 8, and I am leaning towards disabling
the offending ASM routines entirely as an immediate fix.
A full fix (with a split C wrapper to handle the edges) would be the
preferred solution long-term, but this will require a more substantial
rewrite of the scaling core - something that is on my to-do list for 2025.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/6763#comment:5>
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