linux-kernel - [PATCH] hfs: use kzalloc in hfs_find

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Message-ID: <20241022225732.1614156-2-gianf.trad@gmail.com>
Date: Wed, 23 Oct 2024 00:57:33 +0200
From: Gianfranco Trad <gianf.trad@...il.com>
To: brauner@...nel.org,
	josef@...icpanda.com,
	akpm@...ux-foundation.org
Cc: linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	skhan@...uxfoundation.org,
	Gianfranco Trad <gianf.trad@...il.com>,
	syzbot+2e6fb1f89ce5e13cd02d@...kaller.appspotmail.com
Subject: [PATCH] hfs: use kzalloc in hfs_find_init() to fix KMSAN bug

Syzbot reports KMSAN uninit-value use in hfs_free_fork [1].
Use kzalloc() instead of kmalloc() to zero-init fd->search_key
in hfs_find_init() in order to mitigate such KMSAN bug.

[1] https://syzkaller.appspot.com/bug?extid=2e6fb1f89ce5e13cd02d

Reported-by: syzbot+2e6fb1f89ce5e13cd02d@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=2e6fb1f89ce5e13cd02d
Tested-by: syzbot+2e6fb1f89ce5e13cd02d@...kaller.appspotmail.com
Signed-off-by: Gianfranco Trad <gianf.trad@...il.com>
---

Notes: since there's no maintainer for hfs I included Andrew as stated
in the Documentation. I also considered to include the top 2 commiters
to hfs subsytem given by scripts/get_maintainers.pl. Hope it's not a
problem, if so apologies.

 fs/hfs/bfind.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/hfs/bfind.c b/fs/hfs/bfind.c
index ef9498a6e88a..c74d864bc29e 100644
--- a/fs/hfs/bfind.c
+++ b/fs/hfs/bfind.c
@@ -18,7 +18,7 @@ int hfs_find_init(struct hfs_btree *tree, struct hfs_find_data *fd)
 
 	fd->tree = tree;
 	fd->bnode = NULL;
-	ptr = kmalloc(tree->max_key_len * 2 + 4, GFP_KERNEL);
+	ptr = kzalloc(tree->max_key_len * 2 + 4, GFP_KERNEL);
 	if (!ptr)
 		return -ENOMEM;
 	fd->search_key = ptr;
-- 
2.43.0