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[FFmpeg-devel,2/2] avcodec/dvdsubdec: Sanity check len in decode_rle()

Message ID 20180913022450.19376-2-michael@niedermayer.cc
State Accepted
Commit e7b023e1db9fb13175929c02a02846d03510ec91
Headers show

Commit Message

Michael Niedermayer Sept. 13, 2018, 2:24 a.m. UTC 
Fixes: Timeout
Fixes: 9778/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DVDSUB_fuzzer-5186007132536832

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/dvdsubdec.c | 2 ++
 1 file changed, 2 insertions(+)

Comments

Michael Niedermayer Sept. 19, 2018, 9:16 p.m. UTC | #1 
On Thu, Sep 13, 2018 at 04:24:50AM +0200, Michael Niedermayer wrote:
> Fixes: Timeout
> Fixes: 9778/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DVDSUB_fuzzer-5186007132536832
> 
> Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> ---
>  libavcodec/dvdsubdec.c | 2 ++
>  1 file changed, 2 insertions(+)

will apply

[...]
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Patch

diff --git a/libavcodec/dvdsubdec.c b/libavcodec/dvdsubdec.c
index 13d52c8c68..632a53adab 100644
--- a/libavcodec/dvdsubdec.c
+++ b/libavcodec/dvdsubdec.c
@@ -125,6 +125,8 @@  static int decode_rle(uint8_t *bitmap, int linesize, int w, int h, uint8_t used_
             len = decode_run_8bit(&gb, &color);
         else
             len = decode_run_2bit(&gb, &color);
+        if (len != INT_MAX && len > w - x)
+            return AVERROR_INVALIDDATA;
         len = FFMIN(len, w - x);
         memset(d + x, color, len);
         used_color[color] = 1;