[PATCH] crypto : chtls_cm - Fix potential NULL pointer dereferences

[Gustavo A. R. Silva]

Add null checks on lookup_tid() return value in order to prevent
null pointer dereferences.

Addresses-Coverity-ID: 1467422 ("Dereference null return value")
Addresses-Coverity-ID: 1467443 ("Dereference null return value")
Addresses-Coverity-ID: 1467445 ("Dereference null return value")
Addresses-Coverity-ID: 1467449 ("Dereference null return value")
Fixes: cc35c88ae4db ("crypto : chtls - CPL handler definition")
Signed-off-by: Gustavo A. R. Silva <gust...@embeddedor.com>
---
 drivers/crypto/chelsio/chtls/chtls_cm.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/crypto/chelsio/chtls/chtls_cm.c 
b/drivers/crypto/chelsio/chtls/chtls_cm.c
index 82a473a..23c43b8 100644
--- a/drivers/crypto/chelsio/chtls/chtls_cm.c
+++ b/drivers/crypto/chelsio/chtls/chtls_cm.c
@@ -1537,6 +1537,10 @@ static int chtls_rx_data(struct chtls_dev *cdev, struct 
sk_buff *skb)
        struct sock *sk;
 
        sk = lookup_tid(cdev->tids, hwtid);
+       if (unlikely(!sk)) {
+               pr_err("can't find conn. for hwtid %u.\n", hwtid);
+               return -EINVAL;
+       }
        skb_dst_set(skb, NULL);
        process_cpl_msg(chtls_recv_data, sk, skb);
        return 0;
@@ -1585,6 +1589,10 @@ static int chtls_rx_pdu(struct chtls_dev *cdev, struct 
sk_buff *skb)
        struct sock *sk;
 
        sk = lookup_tid(cdev->tids, hwtid);
+       if (unlikely(!sk)) {
+               pr_err("can't find conn. for hwtid %u.\n", hwtid);
+               return -EINVAL;
+       }
        skb_dst_set(skb, NULL);
        process_cpl_msg(chtls_recv_pdu, sk, skb);
        return 0;
@@ -1646,6 +1654,10 @@ static int chtls_rx_cmp(struct chtls_dev *cdev, struct 
sk_buff *skb)
        struct sock *sk;
 
        sk = lookup_tid(cdev->tids, hwtid);
+       if (unlikely(!sk)) {
+               pr_err("can't find conn. for hwtid %u.\n", hwtid);
+               return -EINVAL;
+       }
        skb_dst_set(skb, NULL);
        process_cpl_msg(chtls_rx_hdr, sk, skb);
 
@@ -2105,6 +2117,10 @@ static int chtls_wr_ack(struct chtls_dev *cdev, struct 
sk_buff *skb)
        struct sock *sk;
 
        sk = lookup_tid(cdev->tids, hwtid);
+       if (unlikely(!sk)) {
+               pr_err("can't find conn. for hwtid %u.\n", hwtid);
+               return -EINVAL;
+       }
        process_cpl_msg(chtls_rx_ack, sk, skb);
 
        return 0;
-- 
2.7.4