diff options
| author |  Namjae Jeon <linkinjeon@kernel.org>
| 2022-01-22 10:47:22 +0900 |
|---|---|---|
| committer |  Steve French <stfrench@microsoft.com>
| 2022-01-23 18:19:04 -0600 |
| commit | 9ca8581e79e51c57e60b3b8e3b89d816448f49fe (patch) | |
| tree | beaa16deed33c4e48e66c7c0c0d93347bd865dc6 /fs/ksmbd | |
| parent | Linux 5.17-rc1 (diff) | |
| download | linux-9ca8581e79e51c57e60b3b8e3b89d816448f49fe.tar.gz linux-9ca8581e79e51c57e60b3b8e3b89d816448f49fe.tar.bz2 linux-9ca8581e79e51c57e60b3b8e3b89d816448f49fe.zip | |
ksmbd: fix SMB 3.11 posix extension mount failure
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>
Tested-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/ksmbd')
| -rw-r--r-- | fs/ksmbd/smb2pdu.c | 2 |
1 files changed, 1 insertions, 1 deletions
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; } |