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exfat: short-circuit zero-byte writes in exfat_file_write_iter

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When generic_write_checks() returns zero, it means that
iov_iter_count() is zero, and there is no work to do.

Simply return success like all other filesystems do, rather than
proceeding down the write path, which today yields an -EFAULT in
generic_perform_write() via the
(fault_in_iov_iter_readable(i, bytes) == bytes) check when bytes
== 0.

Fixes: 11a347fb6c ("exfat: change to get file size from DataLength")
Reported-by: Noah <kernel-org-10@maxgrass.eu>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Yuezhang Mo <Yuezhang.Mo@sony.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
This commit is contained in:
Eric Sandeen 2025-02-11 14:14:21 -06:00 • committed by Namjae Jeon
parent 9da33619e0
commit fda94a9919
1 changed files with 1 additions and 1 deletions
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2
fs/exfat/file.c
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@ -587,7 +587,7 @@ static ssize_t exfat_file_write_iter(struct kiocb *iocb, struct iov_iter *iter)
valid_size = ei->valid_size;
ret = generic_write_checks(iocb, iter);
if (ret < 0)
if (ret <= 0)
goto unlock;
if (iocb->ki_flags & IOCB_DIRECT) {