ntfs: handle signal interruption in fallocate

The ntfs_attr_fallocate() function checks for pending signals during
allocation loops and exits early via 'out' label. However, when a signal
interrupts the operation with err == 0, the function returns 0 (success)
instead of -EINTR.

The signal_pending() checks at the allocation loops jump to 'out' without
setting err = -EINTR, so the function returns success even when interrupted
by a signal.

Set err = -EINTR when jumping to the signal exit path, and only override
when no other error is pending. This ensures:

- Allocation interrupted by signal returns -EINTR
- Allocation that completed successfully before signal arrived returns 0
- Other errors are preserved and not overwritten by -EINTR

Fixes: 495e90fa3348 ("ntfs: update attrib operations")
Cc: stable@vger.kernel.org
Signed-off-by: Hongling Zeng <zenghongling@kylinos.cn>
Reviewed-by: Baolin Liu <liubaolin@kylinos.cn>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>

0 files changed, 0 insertions, 0 deletions