[FFmpeg-devel] [PATCH 1/2] avcodec/dirac_vlc: Fix invalid shift
Michael Niedermayer
michael at niedermayer.cc
Fri Jul 28 04:22:39 EEST 2017
Fixes: runtime error: shift exponent 65 is too large for 64-bit type 'residual' (aka 'unsigned long')
Fixes: 2737/clusterfuzz-testcase-minimized-4968639147016192
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/dirac_vlc.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/libavcodec/dirac_vlc.c b/libavcodec/dirac_vlc.c
index 773f720858..f9a6017ec0 100644
--- a/libavcodec/dirac_vlc.c
+++ b/libavcodec/dirac_vlc.c
@@ -96,6 +96,9 @@ int ff_dirac_golomb_read_16bit(DiracGolombLUT *lut_ctx, const uint8_t *buf,
if ((c_idx + 1) > coeffs)
return c_idx;
+ if (res_bits >= RSIZE_BITS)
+ return 0;
+
if (res_bits && l->sign) {
int32_t coeff = 1;
APPEND_RESIDUE(res, l->preamble);
--
2.13.0
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