[FFmpeg-devel] [PATCH 6/7] avcodec/get_bits: dont add a null to a 0

[Michael Niedermayer]

Fixes: undefined behavior
Fixes: 71747/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HEVC_fuzzer-5427736120721408

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/get_bits.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/get_bits.h b/libavcodec/get_bits.h
index fe2f6378b45..beeff87a79b 100644
--- a/libavcodec/get_bits.h
+++ b/libavcodec/get_bits.h
@@ -528,7 +528,7 @@ static inline int init_get_bits(GetBitContext *s, const uint8_t *buffer,
     s->buffer             = buffer;
     s->size_in_bits       = bit_size;
     s->size_in_bits_plus8 = bit_size + 8;
-    s->buffer_end         = buffer + buffer_size;
+    s->buffer_end         = buffer ? buffer + buffer_size : NULL;
     s->index              = 0;
 
     return ret;
-- 
2.46.1