ksmbd: fix potential double free on smb2_read_pipe() error path

Fix new smatch warnings:
fs/smb/server/smb2pdu.c:6131 smb2_read_pipe() error: double free of 'rpc_resp'

Fixes: e2b76ab8b5c9 ("ksmbd: add support for read compound")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c
index 87c6401..93262ca 100644 (file)
--- a/fs/smb/server/smb2pdu.c
+++ b/fs/smb/server/smb2pdu.c
@@ -6152,12 +6152,12 @@ static noinline int smb2_read_pipe(struct ksmbd_work *work)
                memcpy(aux_payload_buf, rpc_resp->payload, rpc_resp->payload_sz);
 
                nbytes = rpc_resp->payload_sz;
-               kvfree(rpc_resp);
                err = ksmbd_iov_pin_rsp_read(work, (void *)rsp,
                                             offsetof(struct smb2_read_rsp, Buffer),
                                             aux_payload_buf, nbytes);
                if (err)
                        goto out;
+               kvfree(rpc_resp);
        } else {
                err = ksmbd_iov_pin_rsp(work, (void *)rsp,
                                        offsetof(struct smb2_read_rsp, Buffer));