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avcodec/cbs_h2645: Avoid an unchecked bytesteram read

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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
Reviewed-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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Michael Niedermayer 2023-07-25 02:13:10 +02:00
parent ac3e6b74bd
commit 0ba719f726
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1 changed files with 1 additions and 1 deletions
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libavcodec/cbs_h2645.c
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@ -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++) {