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webp: Make sure enough bytes are available

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Every chunk needs at least 8 bytes for chunk_type and chunk_size.
Prevent a possible infinite loop.

CC: libav-stable@libav.org
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Andreas Cadhalpun 2015-07-03 01:14:51 +02:00 committed by Luca Barbato
parent 016cac75c6
commit 76d4c62734
1 changed files with 1 additions and 1 deletions
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libavcodec/webp.c
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@ -1362,7 +1362,7 @@ static int webp_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
return AVERROR_INVALIDDATA; return AVERROR_INVALIDDATA;
} }
while (bytestream2_get_bytes_left(&gb) > 0) { while (bytestream2_get_bytes_left(&gb) > 8) {
char chunk_str[5] = { 0 }; char chunk_str[5] = { 0 };
chunk_type = bytestream2_get_le32(&gb); chunk_type = bytestream2_get_le32(&gb);