[PATCH net 6/7] chtls: Added a check to avoid NULL pointer dereference

[Ayush Sawal]

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: cc35c88ae4db ("crypto : chtls - CPL handler definition")
Signed-off-by: Vinay Kumar Yadav <vinay.ya...@chelsio.com>
Signed-off-by: Ayush Sawal <ayush.sa...@chelsio.com>
---
 drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c 
b/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c
index ff3969a24d74..1c6d3c93a0c8 100644
--- a/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c
+++ b/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c
@@ -1597,6 +1597,11 @@ 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);
-- 
2.28.0.rc1.6.gae46588