Issue 40851 in oss-fuzz: libavc:avc_dec_fuzzer: Heap-buffer-overflow in ih264d_mark_err_slice_skip

In ih264d_parse_decode_slice of ih264d_parse_slice.c, there is a possible out of bounds write due to a heap buffer overflow. This could lead to remote information disclosure with no additional execution privileges needed. User interaction is needed for exploitation.