linux-kernel - [PATCH -next] ksmbd: fix memory leak in smb2

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Message-ID: <20231201145048.2179969-1-wozizhi@huawei.com>
Date:   Fri, 1 Dec 2023 22:50:48 +0800
From:   Zizhi Wo <wozizhi@...wei.com>
To:     <linkinjeon@...nel.org>, <sfrench@...ba.org>,
        <senozhatsky@...omium.org>, <lsahlber@...hat.com>,
        <hyc.lee@...il.com>
CC:     <linux-cifs@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <wozizhi@...wei.com>, <yangerkun@...wei.com>
Subject: [PATCH -next] ksmbd: fix memory leak in smb2_lock()

In smb2_lock(), if setup_async_work() executes successfully,
work->cancel_argv will bind the argv that generated by kmalloc(). And
release_async_work() is called in ksmbd_conn_try_dequeue_request() or
smb2_lock() to release argv.
However, when setup_async_work function fails, work->cancel_argv has not
been bound to the argv, resulting in the previously allocated argv not
being released. Call kfree() to fix it.

when setup_async_work fails, the code will go to the
"out" branch, resulting in the previously allocated "argv" not being
released. Call kfree() to fix it.

Fixes: e2f34481b24d ("cifsd: add server-side procedures for SMB3")
Signed-off-by: Zizhi Wo <wozizhi@...wei.com>
---
 fs/smb/server/smb2pdu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c
index 658209839729..67cbeb713f70 100644
--- a/fs/smb/server/smb2pdu.c
+++ b/fs/smb/server/smb2pdu.c
@@ -7078,6 +7078,7 @@ int smb2_lock(struct ksmbd_work *work)
 						      smb2_remove_blocked_lock,
 						      argv);
 				if (rc) {
+					kfree(argv);
 					err = -ENOMEM;
 					goto out;
 				}
-- 
2.39.2