From: Christophe JAILLET christophe.jaillet@wanadoo.fr
commit f8fbfd85f5c95fff477a7c19f576725945891d0c upstream.
All the error handling paths of 'smb2_sess_setup()' end to 'out_err'.
All but the new error handling path added by the commit given in the Fixes tag below.
Fix this error handling path and branch to 'out_err' as well.
Fixes: 0d994cd482ee ("ksmbd: add buffer validation in session setup") Cc: stable@vger.kernel.org # v5.15 Acked-by: Namjae Jeon linkinjeon@kernel.org Signed-off-by: Christophe JAILLET christophe.jaillet@wanadoo.fr Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/ksmbd/smb2pdu.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
--- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -1700,8 +1700,10 @@ int smb2_sess_setup(struct ksmbd_work *w negblob_off = le16_to_cpu(req->SecurityBufferOffset); negblob_len = le16_to_cpu(req->SecurityBufferLength); if (negblob_off < (offsetof(struct smb2_sess_setup_req, Buffer) - 4) || - negblob_len < offsetof(struct negotiate_message, NegotiateFlags)) - return -EINVAL; + negblob_len < offsetof(struct negotiate_message, NegotiateFlags)) { + rc = -EINVAL; + goto out_err; + }
negblob = (struct negotiate_message *)((char *)&req->hdr.ProtocolId + negblob_off);