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idpf: fix potential use-after-free in idpf_tso()

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

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

Fixes: 6818c4d5b3 ("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>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://lore.kernel.org/r/20231103200451.514047-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2023-11-03 20:04:51 +00:00 committed by Jakub Kicinski
parent 9fc3bc7643
commit 115c0f4d58
1 changed files with 4 additions and 2 deletions
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6
drivers/net/ethernet/intel/idpf/idpf_txrx.c
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@ -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);