[PATCH net] idpf: fix potential use-after-free in idpf_tso()

[Eric Dumazet <edumazet@google.com>]

skb_cow_head() can change skb->head (and thus skb_shinfo(skb))

We must not cache skb_shinfo(skb) before skb_cow_head().

Fixes: 6818c4d5b3c2 ("idpf: add splitq start_xmit")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Joshua Hay <joshua.a.hay@intel.com>
Cc: Alan Brady <alan.brady@intel.com>
Cc: Madhu Chittim <madhu.chittim@intel.com>
Cc: Phani Burra <phani.r.burra@intel.com>
Cc: Sridhar Samudrala <sridhar.samudrala@intel.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Pavan Kumar Linga <pavan.kumar.linga@intel.com>
Cc: Tony Nguyen <anthony.l.nguyen@intel.com>
Cc: Bailey Forrest <bcf@google.com>
---
 drivers/net/ethernet/intel/idpf/idpf_txrx.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/idpf/idpf_txrx.c b/drivers/net/ethernet/intel/idpf/idpf_txrx.c
index 5e1ef70d54fe4147a42e5a3263b73cd3e6316679..1f728a9004d9e40d4434534422a42c8c537f5eae 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_txrx.c
+++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.c
@@ -2365,7 +2365,7 @@ static void idpf_tx_splitq_map(struct idpf_queue *tx_q,
  */
 int idpf_tso(struct sk_buff *skb, struct idpf_tx_offload_params *off)
 {
-	const struct skb_shared_info *shinfo = skb_shinfo(skb);
+	const struct skb_shared_info *shinfo;
 	union {
 		struct iphdr *v4;
 		struct ipv6hdr *v6;
@@ -2379,13 +2379,15 @@ int idpf_tso(struct sk_buff *skb, struct idpf_tx_offload_params *off)
 	u32 paylen, l4_start;
 	int err;
 
-	if (!shinfo->gso_size)
+	if (!skb_is_gso(skb))
 		return 0;
 
 	err = skb_cow_head(skb, 0);
 	if (err < 0)
 		return err;
 
+	shinfo = skb_shinfo(skb);
+
 	ip.hdr = skb_network_header(skb);
 	l4.hdr = skb_transport_header(skb);
 
-- 
2.42.0.869.gea05f2083d-goog