Issue:
When using a stack-allocated file structure, the sequence:
1. file_open() initializes the stack file structure
2. file_mmap() creates memory mapping and increments reference count
3. file_munmap() decrements reference count and may free the file structure
4. file_close() attempts to close already freed structure → crash
Root cause:
The memory mapping operations (fs_reffilep/fs_putfilep) manage reference counts
independently and can free the stack-allocated file structure prematurely.
Solution:
- Add reference count protection during file_open() for stack-allocated files
- Clear reference count appropriately during file_close()
- This ensures the file structure remains valid throughout its lifetime
Signed-off-by: dongjiuzhu1 <dongjiuzhu1@xiaomi.com>
cd8e3e18a8