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netfs: Fix subreq ref leak

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Fix a subrequest ref leak in netfs_unbuffered_write() in the event that
subreq->io_iter ends up zero length during preparation.

Fixes: a0b4c7a491 ("netfs: Fix unbuffered/DIO writes to dispatch subrequests in strict sequence")
Link: https://sashiko.dev/#/patchset/20260824120224.504575-1-dhowells%40redhat.com
Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://patch.msgid.link/20260827134304.2075713-6-dhowells@redhat.com
Acked-by: Paulo Alcantara <pc@manguebit.org>
cc: Paulo Alcantara <pc@manguebit.org>
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
This commit is contained in:
David Howells 2026-08-27 14:42:58 +01:00 committed by Christian Brauner
parent 741416a800
commit 3c30087e27
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 7 additions and 1 deletions
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8
fs/netfs/direct_write.c
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@ -121,8 +121,14 @@ static int netfs_unbuffered_write(struct netfs_io_request *wreq)
}
iov_iter_truncate(&subreq->io_iter, wreq->len - wreq->transferred);
if (!iov_iter_count(&subreq->io_iter))
if (!iov_iter_count(&subreq->io_iter)) {
pr_warn("netfs: Unexpected zero-length iterator R=%08x\n",
wreq->debug_id);
__set_bit(NETFS_SREQ_FAILED, &subreq->flags);
netfs_write_subrequest_terminated(subreq, -EIO);
wreq->error = -EIO;
break;
}
subreq->len = netfs_limit_iter(&subreq->io_iter, 0,
stream->sreq_max_len,