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avcodec/exr: Check buf_size more completely 

Fixes: Out of heap array read
Fixes: 4683/clusterfuzz-testcase-minimized-6152313673613312

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 903be5e4f6)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-12-29 03:00:19 +01:00
parent b9a8b4f279
commit d304d7e794
1 changed files with 2 additions and 2 deletions
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4
libavcodec/exr.c
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@ -847,7 +847,7 @@ static int decode_block(AVCodecContext *avctx, void *tdata,
line_offset = AV_RL64(s->gb.buffer + jobnr * 8);
// Check if the buffer has the required bytes needed from the offset
if (line_offset > buf_size - 8)
if (buf_size < 8 || line_offset > buf_size - 8)
return AVERROR_INVALIDDATA;
src = buf + line_offset + 8;
@ -856,7 +856,7 @@ static int decode_block(AVCodecContext *avctx, void *tdata,
return AVERROR_INVALIDDATA;
data_size = AV_RL32(src - 4);
if (data_size <= 0 || data_size > buf_size)
if (data_size <= 0 || data_size > buf_size - line_offset - 8)
return AVERROR_INVALIDDATA;
s->ysize = FFMIN(s->scan_lines_per_block, s->ymax - line + 1);