[PATCH 5.19 0108/1157] ksmbd: fix memory leak in smb2_handle_negotiate

Greg Kroah-Hartman
2022-08-15T22:21:46Z

From: Namjae Jeon <linkinjeon@kernel.org>

commit aa7253c2393f6dcd6a1468b0792f6da76edad917 upstream.

The allocated memory didn't free under an error
path in smb2_handle_negotiate().

Fixes: e2f34481b24d ("cifsd: add server-side procedures for SMB3")
Cc: stable@vger.kernel.org
Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-17815
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Reviewed-by: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/ksmbd/smb2pdu.c | 4 ++++
1 file changed, 4 insertions(+)

--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -1139,12 +1139,16 @@ int smb2_handle_negotiate(struct ksmbd_w
status);
rsp->hdr.Status = status;
rc = -EINVAL;
+ kfree(conn->preauth_info);
+ conn->preauth_info = NULL;
goto err_out;
}

rc = init_smb3_11_server(conn);
if (rc < 0) {
rsp->hdr.Status = STATUS_INVALID_PARAMETER;
+ kfree(conn->preauth_info);
+ conn->preauth_info = NULL;
goto err_out;
}