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avcodec/exr: Check line size for overflow

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Fixes: signed integer overflow: 570425356 * 6 cannot be represented in type 'int
Fixes: 25929/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_EXR_fuzzer-5099197739827200

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 9b72cea446)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-09-26 22:04:16 +02:00
parent c4c59c19c2
commit ff531c345c
1 changed files with 6 additions and 0 deletions
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6
libavcodec/exr.c
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@ -1092,6 +1092,9 @@ static int decode_block(AVCodecContext *avctx, void *tdata,
if ((col + td->xsize) != s->xdelta)/* not the last tile of the line */
axmax = 0; /* doesn't add pixel at the right of the datawindow */
if (td->xsize * (uint64_t)s->current_channel_offset > INT_MAX)
return AVERROR_INVALIDDATA;
td->channel_line_size = td->xsize * s->current_channel_offset;/* uncompress size of one line */
uncompressed_size = td->channel_line_size * (uint64_t)td->ysize;/* uncompress size of the block */
} else {
@ -1111,6 +1114,9 @@ static int decode_block(AVCodecContext *avctx, void *tdata,
td->ysize = FFMIN(s->scan_lines_per_block, s->ymax - line + 1); /* s->ydelta - line ?? */
td->xsize = s->xdelta;
if (td->xsize * (uint64_t)s->current_channel_offset > INT_MAX)
return AVERROR_INVALIDDATA;
td->channel_line_size = td->xsize * s->current_channel_offset;/* uncompress size of one line */
uncompressed_size = td->channel_line_size * (uint64_t)td->ysize;/* uncompress size of the block */