linux-kernel - Re: [syzbot] [netfs?] KASAN: slab-use-after-free Read in iov_iter

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Message-Id: <20240920171409.4054-1-aha310510@gmail.com>
Date: Sat, 21 Sep 2024 02:14:09 +0900
From: Jeongjun Park <aha310510@...il.com>
To: syzbot+7c48153a9d788824044b@...kaller.appspotmail.com
Cc: syzkaller-bugs@...glegroups.com,
	linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [netfs?] KASAN: slab-use-after-free Read in iov_iter_advance

#syz test git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ master

---
 fs/netfs/write_issue.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/netfs/write_issue.c b/fs/netfs/write_issue.c
index 04e66d587f77..8e708d1f7c9d 100644
--- a/fs/netfs/write_issue.c
+++ b/fs/netfs/write_issue.c
@@ -427,6 +427,8 @@ static int netfs_write_folio(struct netfs_io_request *wreq,
 	 * Also skip uploading for data that's been read and just needs copying
 	 * to the cache.
 	 */
+	
+	spin_lock(&wreq->lock);
 	for (int s = 0; s < NR_IO_STREAMS; s++) {
 		stream = &wreq->io_streams[s];
 		stream->submit_off = foff;
@@ -488,6 +490,7 @@ static int netfs_write_folio(struct netfs_io_request *wreq,
 		for (int s = 0; s < NR_IO_STREAMS; s++)
 			netfs_issue_write(wreq, &wreq->io_streams[s]);
 
+	spin_unlock(&wreq->lock);
 	_leave(" = 0");
 	return 0;
 }
--