Re: [PATCH net 7/7] rxrpc: Use skb_unshare() rather than skb_cow_data()

Hillf Danton [off-list ref] wrote:

quoted

+		/* Unshare the packet so that it can be modified for in-place
+		 * decryption.
+		 */
+		if (sp->hdr.securityIndex != 0) {
+			struct sk_buff *nskb = skb_unshare(skb, GFP_ATOMIC);
+			if (!nskb) {
+				rxrpc_eaten_skb(skb, rxrpc_skb_unshared_nomem);
+				goto out;
+			}
+
+			if (nskb != skb) {
+				rxrpc_eaten_skb(skb, rxrpc_skb_received);
+				rxrpc_new_skb(skb, rxrpc_skb_unshared);
+				skb = nskb;
+				sp = rxrpc_skb(skb);
+			}
+		}

Unsharing skb makes it perilous to take a peep at it afterwards.

Ah, good point.  rxrpc_new_skb() should be after the assignment.

David