cifs: Fix the error length of VALIDATE_NEGOTIATE_INFO message
authorZhang Xiaoxu <zhangxiaoxu5@huawei.com>
Mon, 26 Sep 2022 03:36:29 +0000 (11:36 +0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 26 Oct 2022 10:34:19 +0000 (12:34 +0200)
commit60480291c1fcafad8425d93f771b5bcc2bd398b4
tree3fde58ace4c599b7e971b547b9b40ce63978442f
parent0d814a2199cf226d6c48fe8523ae146bed820d08
cifs: Fix the error length of VALIDATE_NEGOTIATE_INFO message

commit e98ecc6e94f4e6d21c06660b0f336df02836694f upstream.

Commit d5c7076b772a ("smb3: add smb3.1.1 to default dialect list")
extend the dialects from 3 to 4, but forget to decrease the extended
length when specific the dialect, then the message length is larger
than expected.

This maybe leak some info through network because not initialize the
message body.

After apply this patch, the VALIDATE_NEGOTIATE_INFO message length is
reduced from 28 bytes to 26 bytes.

Fixes: d5c7076b772a ("smb3: add smb3.1.1 to default dialect list")
Signed-off-by: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
Cc: <stable@vger.kernel.org>
Acked-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Reviewed-by: Tom Talpey <tom@talpey.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
fs/cifs/smb2pdu.c