chtls: Added a check to avoid NULL pointer dereference

[ Upstream commit eade1e0 ] In case of server removal lookup_stid() may return NULL pointer, which is used as listen_ctx. So added a check before accessing this pointer. Fixes: cc35c88 ("crypto : chtls - CPL handler definition") Signed-off-by: Vinay Kumar Yadav <[email protected]> Signed-off-by: Ayush Sawal <[email protected]> Signed-off-by: Jakub Kicinski <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
frank-w · Jan 18, 2021 · 94f354c · 94f354c
1 parent 8ba3ed2
commit 94f354c
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c b/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c
@@ -1596,6 +1596,11 @@ static int chtls_pass_establish(struct chtls_dev *cdev, struct sk_buff *skb)
 			sk_wake_async(sk, 0, POLL_OUT);
 
 		data = lookup_stid(cdev->tids, stid);
+		if (!data) {
+			/* listening server close */
+			kfree_skb(skb);
+			goto unlock;
+		}
 		lsk = ((struct listen_ctx *)data)->lsk;
 
 		bh_lock_sock(lsk);