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avformat/utils: Fix invalid NULL pointer operation in ff_parse_key_value() 

Fixes: pointer index expression with base 0x000000000000 overflowed to 0xffffffffffffffff
Fixes: 44012/clusterfuzz-testcase-minimized-ffmpeg_dem_HLS_fuzzer-5670607746891776

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 59328aabd2)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2022-02-04 00:44:32 +01:00
parent 893c4f1151
commit 2edb753825
1 changed files with 1 additions and 1 deletions
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libavformat/utils.c
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@ -4951,7 +4951,7 @@ void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf,
key_len = ptr - key;
callback_get_buf(context, key, key_len, &dest, &dest_len);
dest_end = dest + dest_len - 1;
dest_end = dest ? dest + dest_len - 1 : NULL;
if (*ptr == '\"') {
ptr++;