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From: Dominique Martinet <asmadeus@codewreck.org>
To: v9fs-developer@lists.sourceforge.net
Cc: Leon Romanovsky <leon@kernel.org>,
	linux_oss@crudebyte.com, linux-kernel@vger.kernel.org,
	syzkaller-bugs@googlegroups.com,
	Dominique Martinet <asmadeus@codewreck.org>
Subject: [PATCH 2/2] 9p: client_create: init fcall_cache earlier
Date: Thu, 29 Sep 2022 06:44:17 +0900	[thread overview]
Message-ID: <20220928214417.1749609-2-asmadeus@codewreck.org> (raw)
In-Reply-To: <20220928214417.1749609-1-asmadeus@codewreck.org>

fcall cache was init'd last for some reason, but we actually allocate
some requests for the version check before that.
Moving the cache creation towards the start also makes p9_client_destroy's
order match the allocation order, which might be easier to think about

Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
---
 net/9p/client.c | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/net/9p/client.c b/net/9p/client.c
index 40b59431a566..1ea326e6e271 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -977,6 +977,17 @@ struct p9_client *p9_client_create(const char *dev_name, char *options)
 	if (err < 0)
 		goto out;
 
+	/* P9_HDRSZ + 4 is the smallest packet header we can have that is
+	 * followed by data accessed from userspace by read
+	 * Note we do not check for failure here because the cache is
+	 * optional; warning will be issued on dmesg for failure.
+	 */
+	clnt->fcall_cache =
+		kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize,
+					   0, 0, P9_HDRSZ + 4,
+					   clnt->msize - (P9_HDRSZ + 4),
+					   NULL);
+
 	if (!clnt->trans_mod)
 		clnt->trans_mod = v9fs_get_default_trans();
 
@@ -1016,15 +1027,6 @@ struct p9_client *p9_client_create(const char *dev_name, char *options)
 	if (err)
 		goto out;
 
-	/* 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,
-					   0, 0, P9_HDRSZ + 4,
-					   clnt->msize - (P9_HDRSZ + 4),
-					   NULL);
-
 	return clnt;
 
 out:
-- 
2.35.1


  reply	other threads:[~2022-09-28 21:44 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-25 11:29 [syzbot] KASAN: use-after-free Read in rdma_close syzbot
2022-09-28 10:07 ` Leon Romanovsky
2022-09-28 10:43   ` asmadeus
2022-09-28 10:49     ` Leon Romanovsky
2022-09-28 11:23       ` asmadeus
2022-09-28 11:54         ` Leon Romanovsky
2022-09-28 12:57           ` Christian Schoenebeck
2022-09-28 21:52             ` asmadeus
2022-09-29  6:10               ` Leon Romanovsky
2022-09-28 21:44   ` [PATCH 1/2] 9p: client_create/destroy: only call trans_mod->close after create Dominique Martinet
2022-09-28 21:44     ` Dominique Martinet [this message]
2022-09-29  5:57       ` [PATCH 2/2] 9p: client_create: init fcall_cache earlier Leon Romanovsky
2022-09-29  7:03         ` Dominique Martinet
2022-09-28 21:58     ` [PATCH 1/2 v2] 9p: client_create/destroy: only call trans_mod->close after create Dominique Martinet
2022-09-28 22:19       ` [PATCH v3] " Dominique Martinet
2022-09-29  5:54         ` Leon Romanovsky
2022-09-29  7:24           ` Dominique Martinet
2022-12-30 10:34 ` [syzbot] KASAN: use-after-free Read in rdma_close syzbot
2023-01-13 10:35 ` syzbot
2023-01-27 10:36 ` syzbot
2023-02-10 10:36 ` syzbot
2023-02-24 10:37 ` syzbot
2023-03-10 10:38 ` syzbot
2023-03-24 10:38 ` syzbot
2023-04-07 10:38 ` syzbot
2023-04-21 10:39 ` syzbot
2023-05-05 10:40 ` syzbot
2023-05-19 10:40 ` syzbot
2023-06-02 10:42 ` syzbot
2023-06-02 10:57   ` Aleksandr Nogikh

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