ffmpeg | branch: master | Michael Niedermayer <mich...@niedermayer.cc> | Tue Apr 10 16:12:15 2018 +0200| [8d381b57fd9d17fb5c3a851ca46c738b3afc33a2] | committer: Michael Niedermayer
avcodec/mjpegdec: Check input buffer size. Fixes: Timeout Fixes: 6381/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEGLS_fuzzer-5665032743419904 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=8d381b57fd9d17fb5c3a851ca46c738b3afc33a2 --- libavcodec/mjpegdec.c | 4 ++++ libavcodec/mjpegdec.h | 1 + 2 files changed, 5 insertions(+) diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c index beef174618..22ca69f841 100644 --- a/libavcodec/mjpegdec.c +++ b/libavcodec/mjpegdec.c @@ -335,6 +335,8 @@ int ff_mjpeg_decode_sof(MJpegDecodeContext *s) av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height); if (av_image_check_size(width, height, 0, s->avctx) < 0) return AVERROR_INVALIDDATA; + if (s->buf_size && (width + 7) / 8 * ((height + 7) / 8) > s->buf_size * 4LL) + return AVERROR_INVALIDDATA; nb_components = get_bits(&s->gb, 8); if (nb_components <= 0 || @@ -2247,6 +2249,8 @@ int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, int ret = 0; int is16bit; + s->buf_size = buf_size; + av_dict_free(&s->exif_metadata); av_freep(&s->stereo3d); s->adobe_transform = -1; diff --git a/libavcodec/mjpegdec.h b/libavcodec/mjpegdec.h index ff301bcb93..653fe7cae6 100644 --- a/libavcodec/mjpegdec.h +++ b/libavcodec/mjpegdec.h @@ -47,6 +47,7 @@ typedef struct MJpegDecodeContext { AVClass *class; AVCodecContext *avctx; GetBitContext gb; + int buf_size; int start_code; /* current start code */ int buffer_size; _______________________________________________ ffmpeg-cvslog mailing list ffmpeg-cvslog@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog
