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| author | Michael Niedermayer <michaelni@gmx.at> | 2013-05-13 18:09:04 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2013-05-13 18:52:00 +0200 |
| commit | 1e00bbb10cbde3da03a1e744265ce6def9ae4c56 (patch) | |
| tree | 52a9802dbf51e11fcccd65b862b55b12bf666c0d | |
| parent | b3c263e20925628eabf785afae5a9d7cc5d8bb4d (diff) | |
| download | ffmpeg-1e00bbb10cbde3da03a1e744265ce6def9ae4c56.tar.gz | |
avcodec/lcldec: Check that dimensions are a multiple of the subsample factors
Other dimensions would not work correctly currently,
also ask for a sample for files that fail this check.
This fixes an integer overflow leading to out of array
accesses.
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
| -rw-r--r-- | libavcodec/lcldec.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/libavcodec/lcldec.c b/libavcodec/lcldec.c index 7948199802..ad7ef91e8d 100644 --- a/libavcodec/lcldec.c +++ b/libavcodec/lcldec.c @@ -42,6 +42,7 @@ #include <stdlib.h> #include "libavutil/mem.h" +#include "libavutil/pixdesc.h" #include "avcodec.h" #include "bytestream.h" #include "internal.h" @@ -482,6 +483,7 @@ static av_cold int decode_init(AVCodecContext *avctx) unsigned int max_basesize = FFALIGN(avctx->width, 4) * FFALIGN(avctx->height, 4); unsigned int max_decomp_size; + int subsample_h, subsample_v; if (avctx->extradata_size < 8) { av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n"); @@ -507,6 +509,10 @@ static av_cold int decode_init(AVCodecContext *avctx) max_decomp_size = max_basesize * 2; avctx->pix_fmt = AV_PIX_FMT_YUV422P; av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:2.\n"); + if (avctx->width % 4) { + avpriv_request_sample(avctx, "Unsupported dimensions\n"); + return AVERROR_INVALIDDATA; + } break; case IMGTYPE_RGB24: c->decomp_size = basesize * 3; @@ -537,6 +543,12 @@ static av_cold int decode_init(AVCodecContext *avctx) return AVERROR_INVALIDDATA; } + av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &subsample_h, &subsample_v); + if (avctx->width % (1<<subsample_h) || avctx->height % (1<<subsample_v)) { + avpriv_request_sample(avctx, "Unsupported dimensions\n"); + return AVERROR_INVALIDDATA; + } + /* Detect compression method */ c->compression = (int8_t)avctx->extradata[5]; switch (avctx->codec_id) { |