This is a note to let you know that I've just added the patch titled
ionic: linearize tso skb with too many frags
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ionic-linearize-tso-skb-with-too-many-frags.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 287476c825efc1d467404b948c2238bfbc75e32e
Author: Shannon Nelson <snelson@xxxxxxxxxxx>
Date: Tue Mar 16 17:07:47 2021 -0700
ionic: linearize tso skb with too many frags
[ Upstream commit d2c21422323b06938b3c070361dc544f047489d7 ]
We were linearizing non-TSO skbs that had too many frags, but
we weren't checking number of frags on TSO skbs. This could
lead to a bad page reference when we received a TSO skb with
more frags than the Tx descriptor could support.
v2: use gso_segs rather than yet another division
don't rework the check on the nr_frags
Fixes: 0f3154e6bcb3 ("ionic: Add Tx and Rx handling")
Signed-off-by: Shannon Nelson <snelson@xxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_txrx.c b/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
index a81feffb09b8..909eca14f647 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
@@ -1077,15 +1077,17 @@ static int ionic_tx_descs_needed(struct ionic_queue *q, struct sk_buff *skb)
{
int sg_elems = q->lif->qtype_info[IONIC_QTYPE_TXQ].max_sg_elems;
struct ionic_tx_stats *stats = q_to_tx_stats(q);
+ int ndescs;
int err;
- /* If TSO, need roundup(skb->len/mss) descs */
+ /* Each desc is mss long max, so a descriptor for each gso_seg */
if (skb_is_gso(skb))
- return (skb->len / skb_shinfo(skb)->gso_size) + 1;
+ ndescs = skb_shinfo(skb)->gso_segs;
+ else
+ ndescs = 1;
- /* If non-TSO, just need 1 desc and nr_frags sg elems */
if (skb_shinfo(skb)->nr_frags <= sg_elems)
- return 1;
+ return ndescs;
/* Too many frags, so linearize */
err = skb_linearize(skb);
@@ -1094,8 +1096,7 @@ static int ionic_tx_descs_needed(struct ionic_queue *q, struct sk_buff *skb)
stats->linearize++;
- /* Need 1 desc and zero sg elems */
- return 1;
+ return ndescs;
}
static int ionic_maybe_stop_tx(struct ionic_queue *q, int ndescs)
