crypto: chtls - dereference null variable

skb dereferenced before check in sendpage

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Atul Gupta <atul.gupta@chelsio.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 1 insertions, 2 deletions

diff --git a/drivers/crypto/chelsio/chtls/chtls_io.c b/drivers/crypto/chelsio/chtls/chtls_io.c
index 7aa5d90c6ebd..8cfc27b4337d 100644
--- a/drivers/crypto/chelsio/chtls/chtls_io.c
+++ b/drivers/crypto/chelsio/chtls/chtls_io.c
@@ -1230,9 +1230,8 @@ int chtls_sendpage(struct sock *sk, struct page *page,
                 struct sk_buff *skb = skb_peek_tail(&csk->txq);
                 int copy, i;
 
-                copy = mss - skb->len;
                 if (!skb || (ULP_SKB_CB(skb)->flags & ULPCB_FLAG_NO_APPEND) ||
-                    copy <= 0) {
+                    (copy = mss - skb->len) <= 0) {
 new_buf:
                         if (!csk_mem_free(cdev, sk))
                                 goto wait_for_sndbuf;