RTEMS | libdl: Fix NULL pointer deref in rap app alloc (!1363)

[Yang Zhang (@Chloe)]

Yang Zhang created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1363

Project:Branches: Chloe/rtems:fix-rap-null-deref to rtems/rtos/rtems:main
Author:   Yang Zhang



## Summary

In rtems_rap_app_alloc(), the return value of malloc() is passed directly to memset() and rtems_chain_append() without being checked.

If the memory allocation fails, this results in a NULL pointer dereference and a system crash. Therefore, I revise the code to explicitly check for NULL before using the descriptor.

## Generative AI

None

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1363
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