[ Upstream commit 73f949ea87c7d697210653501ca21efe57295327 ]
If ->iov_idx is zero, This means that the iov vector for the response was not added during the request process. In other words, it means that there is a problem in generating a response, So this patch return as an error to avoid NULL pointer dereferencing problem.
Signed-off-by: Namjae Jeon linkinjeon@kernel.org Signed-off-by: Steve French stfrench@microsoft.com --- fs/smb/server/connection.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/fs/smb/server/connection.c b/fs/smb/server/connection.c index d1f4ed18a227..4b38c3a285f6 100644 --- a/fs/smb/server/connection.c +++ b/fs/smb/server/connection.c @@ -199,6 +199,9 @@ int ksmbd_conn_write(struct ksmbd_work *work) if (work->send_no_response) return 0;
+ if (!work->iov_idx) + return -EINVAL; + ksmbd_conn_lock(conn); sent = conn->transport->ops->writev(conn->transport, work->iov, work->iov_cnt,