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

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Message-ID: <66ee120c.050a0220.3195df.001f.GAE@google.com>
Date: Fri, 20 Sep 2024 17:23:40 -0700
From: syzbot <syzbot+921873345a95f4dae7e9@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [PATCH] netfs: Fix a KMSAN uninit-value error in netfs_clear_buffer

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Subject: [PATCH] netfs: Fix a KMSAN uninit-value error in netfs_clear_buffer
Author: marcus.yu.56@...il.com

#syz test

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>
---
 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