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ntfs: handle signal interruption in fallocate

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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: 495e90fa33 ("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>
This commit is contained in:
Hongling Zeng 2026-08-26 13:59:53 +08:00 committed by Namjae Jeon
parent 03c6ecc4b4
commit 4dc8f4ee2d
1 changed files with 6 additions and 2 deletions
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8
fs/ntfs/attrib.c
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@ -5709,7 +5709,7 @@ int ntfs_attr_fallocate(struct ntfs_inode *ni, loff_t start, loff_t byte_len, bo
}
if (signal_pending(current))
goto out;
goto signal_out;
vcn += alloc_cnt;
try_alloc_cnt -= alloc_cnt;
@ -5730,7 +5730,7 @@ int ntfs_attr_fallocate(struct ntfs_inode *ni, loff_t start, loff_t byte_len, bo
up_write(&ni->runlist.lock);
mutex_unlock(&ni->mrec_lock);
if (err || signal_pending(current))
goto out;
goto signal_out;
vcn += alloc_cnt;
try_alloc_cnt -= alloc_cnt;
@ -5756,4 +5756,8 @@ int ntfs_attr_fallocate(struct ntfs_inode *ni, loff_t start, loff_t byte_len, bo
mutex_unlock(&ni->mrec_lock);
out:
return err >= 0 ? 0 : err;
signal_out:
if (!err)
err = -EINTR;
goto out;
}