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avcodec/pngdec: Don't use unsigned for width, height

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Otherwise p->linesize[0] * y will be evaluated as an unsigned
which leads to segfaults in case linesize is negative.
This happens in the apng-dispose-previous FATE-test in case
one makes get_buffer return pictures with negative linesizes.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2022-09-29 01:45:23 +02:00
parent 04196852a2
commit 042c1966da
1 changed files with 1 additions and 1 deletions
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2
libavcodec/pngdec.c
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@ -1387,7 +1387,7 @@ exit_loop:
if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE) {
size_t byte_depth = s->bit_depth > 8 ? 2 : 1;
size_t raw_bpp = s->bpp - byte_depth;
unsigned x, y;
ptrdiff_t x, y;
av_assert0(s->bit_depth > 1);