linux-kernel - [PATCH AUTOSEL 5.15 01/10] 9p: Avoid creating multiple slab caches with the same name

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Message-ID: <20241023143235.2982363-1-sashal@kernel.org>
Date: Wed, 23 Oct 2024 10:32:22 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Pedro Falcato <pedro.falcato@...il.com>,
	syzbot+3c5d43e97993e1fa612b@...kaller.appspotmail.com,
	Dominique Martinet <asmadeus@...ewreck.org>,
	Sasha Levin <sashal@...nel.org>,
	ericvh@...nel.org,
	lucho@...kov.net,
	v9fs@...ts.linux.dev
Subject: [PATCH AUTOSEL 5.15 01/10] 9p: Avoid creating multiple slab caches with the same name

From: Pedro Falcato <pedro.falcato@...il.com>

[ Upstream commit 79efebae4afc2221fa814c3cae001bede66ab259 ]

In the spirit of [1], avoid creating multiple slab caches with the same
name. Instead, add the dev_name into the mix.

[1]: https://lore.kernel.org/all/20240807090746.2146479-1-pedro.falcato@gmail.com/

Signed-off-by: Pedro Falcato <pedro.falcato@...il.com>
Reported-by: syzbot+3c5d43e97993e1fa612b@...kaller.appspotmail.com
Message-ID: <20240807094725.2193423-1-pedro.falcato@...il.com>
Signed-off-by: Dominique Martinet <asmadeus@...ewreck.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/9p/client.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/net/9p/client.c b/net/9p/client.c
index bf29462c919bb..03fb36d938c70 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -1005,6 +1005,7 @@ struct p9_client *p9_client_create(const char *dev_name, char *options)
 	int err;
 	struct p9_client *clnt;
 	char *client_id;
+	char *cache_name;
 
 	err = 0;
 	clnt = kmalloc(sizeof(*clnt), GFP_KERNEL);
@@ -1057,15 +1058,22 @@ struct p9_client *p9_client_create(const char *dev_name, char *options)
 	if (err)
 		goto close_trans;
 
+	cache_name = kasprintf(GFP_KERNEL, "9p-fcall-cache-%s", dev_name);
+	if (!cache_name) {
+		err = -ENOMEM;
+		goto close_trans;
+	}
+
 	/* P9_HDRSZ + 4 is the smallest packet header we can have that is
 	 * followed by data accessed from userspace by read
 	 */
 	clnt->fcall_cache =
-		kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize,
+		kmem_cache_create_usercopy(cache_name, clnt->msize,
 					   0, 0, P9_HDRSZ + 4,
 					   clnt->msize - (P9_HDRSZ + 4),
 					   NULL);
 
+	kfree(cache_name);
 	return clnt;
 
 close_trans:
-- 
2.43.0