On 7/24/2023 9:46 PM, Michael Niedermayer wrote:
The unchecked read caused the 2nd subsequent tell call to move backward
resulting
in a negative length
Fixes: assertion failure
Fixes:
60276/clusterfuzz-testcase-minimized-ffmpeg_BSF_TRACE_HEADERS_fuzzer-5434126636023808
Found-by: continuous fuzzing process
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
libavcodec/cbs_h2645.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/cbs_h2645.c b/libavcodec/cbs_h2645.c
index 34c5d1d372..21c8bc76d5 100644
--- a/libavcodec/cbs_h2645.c
+++ b/libavcodec/cbs_h2645.c
@@ -695,7 +695,7 @@ static int cbs_h2645_split_fragment(CodedBitstreamContext
*ctx,
int nal_unit_type = bytestream2_get_byte(&gbc) & 0x1f;
unsigned int num_nalus = 1;
if(nal_unit_type != VVC_DCI_NUT && nal_unit_type != VVC_OPI_NUT)
- num_nalus = bytestream2_get_be16u(&gbc);
+ num_nalus = bytestream2_get_be16(&gbc);
start = bytestream2_tell(&gbc);
for(i = 0; i < num_nalus; i++) {
LGTM.
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