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ksmbd: check iov vector index in ksmbd_conn_write()

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[ Upstream commit 73f949ea87 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Namjae Jeon
2023-12-31 16:13:03 +09:00
committed by Greg Kroah-Hartman
parent 8beae8a0a0
commit 7345f5dbf6
1 changed files with 3 additions and 0 deletions
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3
fs/smb/server/connection.c
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@@ -199,6 +199,9 @@ int ksmbd_conn_write(struct ksmbd_work *work)
if (work->send_no_response) if (work->send_no_response)
return 0; return 0;
if (!work->iov_idx)
return -EINVAL;
ksmbd_conn_lock(conn); ksmbd_conn_lock(conn);
sent = conn->transport->ops->writev(conn->transport, work->iov, sent = conn->transport->ops->writev(conn->transport, work->iov,
work->iov_cnt, work->iov_cnt,