linux-kernel - Re: [netfs?] KASAN: slab-use-after-free Write in io_submit

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Message-ID: <tencent_C7123BDDD75DA11956CFE20D8225938DEB07@qq.com>
Date: Fri, 14 Feb 2025 20:46:13 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+e1dc29a4daf3f8051130@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [netfs?] KASAN: slab-use-after-free Write in io_submit_one

#syz test

diff --git a/fs/netfs/read_collect.c b/fs/netfs/read_collect.c
index f65affa5a9e4..40c408705f1a 100644
--- a/fs/netfs/read_collect.c
+++ b/fs/netfs/read_collect.c
@@ -371,9 +371,13 @@ static void netfs_rreq_assess_dio(struct netfs_io_request *rreq)
 
 	if (rreq->iocb) {
 		rreq->iocb->ki_pos += rreq->transferred;
-		if (rreq->iocb->ki_complete)
+		if (rreq->iocb->ki_complete) {
+			if (rreq->transferred < rreq->len)
+				refcount_add_not_zero(&rreq->iocb->ki_refcnt);
+
 			rreq->iocb->ki_complete(
 				rreq->iocb, rreq->error ? rreq->error : rreq->transferred);
+		}
 	}
 	if (rreq->netfs_ops->done)
 		rreq->netfs_ops->done(rreq);