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ksmbd: fix SMB 3.11 posix extension mount failure

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commit 9ca8581e79e51c57e60b3b8e3b89d816448f49fe upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Namjae Jeon 2022-01-22 10:47:22 +09:00 committed by Greg Kroah-Hartman
parent 14f880ea77
commit ab32ea3ad0
1 changed files with 1 additions and 1 deletions
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2
fs/ksmbd/smb2pdu.c
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@ -2690,7 +2690,7 @@ 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;
}