[FD] libheif v1.21.0 Null Pointer Dereference in Box_hdlr::get_handler_type

[Ron E <ronaldjedgerson@xxxxxxxxx>]

Box_hdlr::get_handler_type() (libheif/box.h:487) is called even when the
hdlr box has not been properly initialized due to malformed input. This
leads to dereferencing a null object pointer.

*Root Cause:*

   -

   No validation of hdlr box presence before accessing handler fields.

*Impact:*

   -

   Application crash only (DoS).
   -

   No memory corruption or exploitability.



*Evidence:*==2436988==ERROR: AddressSanitizer: SEGV on unknown address
0x0000000000ac
#0 Box_hdlr::get_handler_type() const libheif/box.h:487
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