From: Marios Makassikis mmakassikis@freebox.fr
commit 78f1688a64cca77758ceb9b183088cf0054bfc82 upstream.
The validate_negotiate_info_req struct definition includes an extra field to access the data coming after the header. This causes the check in fsctl_validate_negotiate_info() to count the first element of the array twice. This in turn makes some valid requests fail, depending on whether they include padding or not.
Fixes: f7db8fd03a4b ("ksmbd: add validation in smb2_ioctl") Cc: stable@vger.kernel.org # v5.15 Acked-by: Namjae Jeon linkinjeon@kernel.org Acked-by: Hyunchul Lee hyc.lee@gmail.com Signed-off-by: Marios Makassikis mmakassikis@freebox.fr Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/ksmbd/smb2pdu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -7319,7 +7319,7 @@ static int fsctl_validate_negotiate_info int ret = 0; int dialect;
- if (in_buf_len < sizeof(struct validate_negotiate_info_req) + + if (in_buf_len < offsetof(struct validate_negotiate_info_req, Dialects) + le16_to_cpu(neg_req->DialectCount) * sizeof(__le16)) return -EINVAL;