[RFC / RFT net 1/7] tls: rx: device: fix checking decryption status

[Jakub Kicinski <kuba@kernel.org>]

skb->len covers the entire skb, including the frag_list.
In fact we're guaranteed that rxm->full_len <= skb->len,
so since the change under Fixes we were not checking decrypt
status of any skb but the first.

Note that the skb_pagelen() added here may feel a bit costly,
but it's removed by subsequent fixes, anyway.

Reported-by: Tariq Toukan <tariqt@nvidia.com>
Fixes: 86b259f6f888 ("tls: rx: device: bound the frag walk")
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 net/tls/tls_device.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c
index a7cc4f9faac2..3b87c7b04ac8 100644
--- a/net/tls/tls_device.c
+++ b/net/tls/tls_device.c
@@ -1012,7 +1012,7 @@ int tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx)
 	struct sk_buff *skb_iter;
 	int left;
 
-	left = rxm->full_len - skb->len;
+	left = rxm->full_len + rxm->offset - skb_pagelen(skb);
 	/* Check if all the data is decrypted already */
 	skb_iter = skb_shinfo(skb)->frag_list;
 	while (skb_iter && left > 0) {
-- 
2.40.1