libheif v1.21.0 Out-of-Bounds Read in Box_stts::get_sample_duration

[Ron E <ronaldjedgerson () gmail com>]

The Box_stts structure defines decoding time to sample mapping. In
Box_stts::get_sample_duration(unsigned), the requested index is assumed
valid. A crafted file can set entry_count inconsistently with the actual
buffer size, leading to access beyond the bounds of the parsed vector.

*Root Cause:*

   -

   Lack of bounds checks on entry_count and indexing operations.
   -

   Blind trust in stts box metadata.

*Impact:*

   -

   Invalid memory access → denial of service.
   -

   Information disclosure: reading adjacent heap contents may leak
   sensitive data.



*Evidence:*SUMMARY: AddressSanitizer: SEGV in
Box_stts::get_sample_duration(unsigned)
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