linux-kernel - [PATCH] netfs: Fix a KMSAN uninit-value error in netfs_clear

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Message-ID: <Zu4doSKzXfSuVipQ@gmail.com>
Date: Fri, 20 Sep 2024 18:13:05 -0700
From: Chang Yu <marcus.yu.56@...il.com>
To: dhowells@...hat.com
Cc: jlayton@...nel.org, netfs@...ts.linux.dev,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	marcus.yu.56@...il.com, skhan@...uxfoundation.org
Subject: [PATCH] netfs: Fix a KMSAN uninit-value error in netfs_clear_buffer

Use kzalloc instead of kmalloc in netfs_buffer_append_folio to fix
a KMSAN uninit-value error in netfs_clear_buffer

Signed-off-by: Chang Yu <marcus.yu.56@...il.com>
Reported-by: syzbot+921873345a95f4dae7e9@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=921873345a95f4dae7e9
Fixes: cd0277ed0c18 ("netfs: Use new folio_queue data type and iterator instead of xarray iter")
---
 fs/netfs/misc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/netfs/misc.c b/fs/netfs/misc.c
index 0ad0982ce0e2..6f967b6d30b6 100644
--- a/fs/netfs/misc.c
+++ b/fs/netfs/misc.c
@@ -22,7 +22,7 @@ int netfs_buffer_append_folio(struct netfs_io_request *rreq, struct folio *folio
 		return -EIO;
 
 	if (!tail || folioq_full(tail)) {
-		tail = kmalloc(sizeof(*tail), GFP_NOFS);
+		tail = kzalloc(sizeof(*tail), GFP_NOFS);
 		if (!tail)
 			return -ENOMEM;
 		netfs_stat(&netfs_n_folioq);
-- 
2.46.0