tls: rx: device: don't try to copy too much on detach

Another device offload bug, we use the length of the output
skb as an indication of how much data to copy. But that skb
is sized to offset + record length, and we start from offset.
So we end up double-counting the offset which leads to
skb_copy_bits() returning -EFAULT.

Reported-by: Tariq Toukan <[email protected]>
Fixes: 84c61fe ("tls: rx: do not use the standard strparser")
Tested-by: Ran Rozenstein <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: kuba-moo

net/tls/tls_strp.c

@@ -41,7 +41,7 @@ static struct sk_buff *tls_strp_msg_make_copy(struct tls_strparser *strp)
 	struct sk_buff *skb;
 	int i, err, offset;
 
-	skb = alloc_skb_with_frags(0, strp->anchor->len, TLS_PAGE_ORDER,
+	skb = alloc_skb_with_frags(0, strp->stm.full_len, TLS_PAGE_ORDER,
 				   &err, strp->sk->sk_allocation);
 	if (!skb)
 		return NULL;