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Code Issues Releases Activity

rv34: Check for invalid slice offsets

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Signed-off-by: Martin Storsjö <martin@martin.st>
(cherry picked from commit 4cc7732386eb36661ed22d1200339b38a5fa60bc)

Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Laurent Aimar 2011-09-19 22:48:53 +02:00 committed by Michael Niedermayer
parent ef93642aac
commit a9ded3d272
1 changed files with 5 additions and 4 deletions
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9
libavcodec/rv34.c
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@ -1401,8 +1401,9 @@ int ff_rv34_decode_frame(AVCodecContext *avctx,
slice_count = avctx->slice_count; slice_count = avctx->slice_count;
//parse first slice header to check whether this frame can be decoded //parse first slice header to check whether this frame can be decoded
if(get_slice_offset(avctx, slices_hdr, 0) > buf_size){ if(get_slice_offset(avctx, slices_hdr, 0) < 0 ||
av_log(avctx, AV_LOG_ERROR, "Slice offset is greater than frame size\n"); get_slice_offset(avctx, slices_hdr, 0) > buf_size){
av_log(avctx, AV_LOG_ERROR, "Slice offset is invalid\n");
return -1; return -1;
} }
init_get_bits(&s->gb, buf+get_slice_offset(avctx, slices_hdr, 0), buf_size-get_slice_offset(avctx, slices_hdr, 0)); init_get_bits(&s->gb, buf+get_slice_offset(avctx, slices_hdr, 0), buf_size-get_slice_offset(avctx, slices_hdr, 0));
@ -1430,8 +1431,8 @@ int ff_rv34_decode_frame(AVCodecContext *avctx,
else else
size= get_slice_offset(avctx, slices_hdr, i+1) - offset; size= get_slice_offset(avctx, slices_hdr, i+1) - offset;
if(offset > buf_size){ if(offset < 0 || offset > buf_size || size < 0){
av_log(avctx, AV_LOG_ERROR, "Slice offset is greater than frame size\n"); av_log(avctx, AV_LOG_ERROR, "Slice offset is invalid\n");
break; break;
} }