From: Namjae Jeon <linkinjeon@kernel.org>
To: linux-cifs@vger.kernel.org
Cc: Namjae Jeon <linkinjeon@kernel.org>,
stable@vger.kernel.org, Steve French <smfrench@gmail.com>
Subject: [PATCH] ksmbd: fix SMB 3.11 posix extension mount failure
Date: Sat, 22 Jan 2022 10:47:22 +0900 [thread overview]
Message-ID: <20220122014722.8699-1-linkinjeon@kernel.org> (raw)
cifs client set 4 to DataLength of create_posix context, which mean
Mode variable of create_posix context is only available. So buffer
validation of ksmbd should check only the size of Mode except for
the size of Reserved variable.
Fixes: 8f77150c15f8 ("ksmbd: add buffer validation for SMB2_CREATE_CONTEXT")
Cc: stable@vger.kernel.org # v5.15+
Reported-by: Steve French <smfrench@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
---
fs/ksmbd/smb2pdu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index 1866c81c5c99..3926ca18dca4 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -2688,7 +2688,7 @@ int smb2_open(struct ksmbd_work *work)
(struct create_posix *)context;
if (le16_to_cpu(context->DataOffset) +
le32_to_cpu(context->DataLength) <
- sizeof(struct create_posix)) {
+ sizeof(struct create_posix) - 4) {
rc = -EINVAL;
goto err_out1;
}
--
2.25.1
next reply other threads:[~2022-01-22 1:47 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-22 1:47 Namjae Jeon [this message]
2022-01-22 5:00 ` [PATCH] ksmbd: fix SMB 3.11 posix extension mount failure Steve French
2022-01-23 0:53 ` Namjae Jeon
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