[FFmpeg-devel] [PATCH 2/3] avcodec/gdv: Check available space before reading palette

Michael Niedermayer michael at niedermayer.cc
Sat Aug 12 00:21:22 EEST 2017


Fixes: Timeout
Fixes: 2926/clusterfuzz-testcase-498711001458278

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

diff --git a/libavcodec/gdv.c b/libavcodec/gdv.c
index b324e4f26e..dc91869edf 100644
--- a/libavcodec/gdv.c
+++ b/libavcodec/gdv.c
@@ -427,6 +427,8 @@ static int gdv_decode_frame(AVCodecContext *avctx, void *data,
     case 1:
         memset(gdv->frame + PREAMBLE_SIZE, 0, gdv->frame_size - PREAMBLE_SIZE);
     case 0:
+        if (bytestream2_get_bytes_left(gb) < 256*3)
+            return AVERROR_INVALIDDATA;
         for (i = 0; i < 256; i++) {
             unsigned r = bytestream2_get_byte(gb);
             unsigned g = bytestream2_get_byte(gb);
-- 
2.13.0



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