RTEMS | dosfs: Fix dangling fs_info pointer on initialization error (!1438)

[Yang Zhang (@Chloe)]

Yang Zhang created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1438

Project:Branches: Chloe/rtems:fix-dosfs-dangling-fs-info to rtems/rtos/rtems:main
Author:   Yang Zhang



## Summary

In msdos_initialize_support(), temp_mt_entry-\>fs_info was assigned the allocated fs_info structure before volume initialization. If subsequent steps failed (such as volume init, root directory open, or cluster buffer allocation), fs_info was freed, but temp_mt_entry-\>fs_info was left pointing to freed memory.

This created a dangling pointer in the mount table entry, which could lead to use-after-free or double-free errors during cleanup.

Fix this by delaying the assignment of temp_mt_entry-\>fs_info until all initialization steps have successfully completed.

## Generative AI

None

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1438
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