Messages in this thread | | | Date | Thu, 17 Nov 2022 15:05:27 +0200 | From | Leon Romanovsky <> | Subject | Re: [PATCH net] sfc: fix potential memleak in __ef100_hard_start_xmit() |
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On Thu, Nov 17, 2022 at 08:41:52PM +0800, Zhang Changzhong wrote: > > > On 2022/11/17 19:36, Leon Romanovsky wrote: > > On Thu, Nov 17, 2022 at 03:50:09PM +0800, Zhang Changzhong wrote: > >> The __ef100_hard_start_xmit() returns NETDEV_TX_OK without freeing skb > >> in error handling case, add dev_kfree_skb_any() to fix it. > >> > >> Fixes: 51b35a454efd ("sfc: skeleton EF100 PF driver") > >> Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com> > >> --- > >> drivers/net/ethernet/sfc/ef100_netdev.c | 1 + > >> 1 file changed, 1 insertion(+) > >> > >> diff --git a/drivers/net/ethernet/sfc/ef100_netdev.c b/drivers/net/ethernet/sfc/ef100_netdev.c > >> index 88fa295..ddcc325 100644 > >> --- a/drivers/net/ethernet/sfc/ef100_netdev.c > >> +++ b/drivers/net/ethernet/sfc/ef100_netdev.c > >> @@ -218,6 +218,7 @@ netdev_tx_t __ef100_hard_start_xmit(struct sk_buff *skb, > >> skb->len, skb->data_len, channel->channel); > >> if (!efx->n_channels || !efx->n_tx_channels || !channel) { > >> netif_stop_queue(net_dev); > >> + dev_kfree_skb_any(skb); > >> goto err; > >> } > > > > ef100 doesn't release in __ef100_enqueue_skb() either. SKB shouldn't be > > NULL or ERR at this stage. > > SKB shouldn't be NULL or ERR, so it can be freed. But this code looks weird.
Please take a look __ef100_enqueue_skb() and see if it frees SKB on error or not. If not, please fix it.
Thanks
> > > > > diff --git a/drivers/net/ethernet/sfc/ef100_tx.c b/drivers/net/ethernet/sfc/ef100_tx.c > > index 29ffaf35559d..426706b91d02 100644 > > --- a/drivers/net/ethernet/sfc/ef100_tx.c > > +++ b/drivers/net/ethernet/sfc/ef100_tx.c > > @@ -497,7 +497,7 @@ int __ef100_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb, > > > > err: > > efx_enqueue_unwind(tx_queue, old_insert_count); > > - if (!IS_ERR_OR_NULL(skb)) > > + if (rc) > > dev_kfree_skb_any(skb); > > > > /* If we're not expecting another transmit and we had something to push > > > > > >> > >> -- > >> 2.9.5 > >> > > . > >
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