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Miller" , Jakub Kicinski Cc: Dongliang Mu , Alexander Aring , linux-wpan@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] ieee802154: hwsim: fix memory leak in __pskb_copy_fclone Date: Tue, 13 Jul 2021 13:40:18 +0800 Message-Id: <20210713054019.409273-1-mudongliangabcd@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-wpan@vger.kernel.org hwsim_hw_xmit fails to deallocate the newskb copied by pskb_copy. Fix this by adding kfree_skb after ieee802154_rx_irqsafe. [] __alloc_skb+0x22b/0x250 net/core/skbuff.c:414 [] __pskb_copy_fclone+0x75/0x360 net/core/skbuff.c:1609 [] __pskb_copy include/linux/skbuff.h:1176 [inline] [] pskb_copy include/linux/skbuff.h:3207 [inline] [] hwsim_hw_xmit+0xd3/0x140 drivers/net/ieee802154/mac802154_hwsim.c:132 [] drv_xmit_async net/mac802154/driver-ops.h:16 [inline] [] ieee802154_tx+0xc7/0x190 net/mac802154/tx.c:83 [] ieee802154_subif_start_xmit+0x58/0x70 net/mac802154/tx.c:132 [] __netdev_start_xmit include/linux/netdevice.h:4944 [inline] [] netdev_start_xmit include/linux/netdevice.h:4958 [inline] [] xmit_one net/core/dev.c:3658 [inline] [] dev_hard_start_xmit+0xe2/0x330 net/core/dev.c:3674 [] sch_direct_xmit+0xf8/0x520 net/sched/sch_generic.c:342 [] __dev_xmit_skb net/core/dev.c:3874 [inline] [] __dev_queue_xmit+0xa3b/0x1360 net/core/dev.c:4241 [] dgram_sendmsg+0x437/0x570 net/ieee802154/socket.c:682 [] sock_sendmsg_nosec net/socket.c:702 [inline] [] sock_sendmsg+0x56/0x80 net/socket.c:722 Fixes: f25da51fdc38 ("ieee802154: hwsim: add replacement for fakelb") Signed-off-by: Dongliang Mu --- drivers/net/ieee802154/mac802154_hwsim.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/net/ieee802154/mac802154_hwsim.c b/drivers/net/ieee802154/mac802154_hwsim.c index ebc976b7fcc2..d97ed033ac77 100644 --- a/drivers/net/ieee802154/mac802154_hwsim.c +++ b/drivers/net/ieee802154/mac802154_hwsim.c @@ -132,9 +132,11 @@ static int hwsim_hw_xmit(struct ieee802154_hw *hw, struct sk_buff *skb) struct sk_buff *newskb = pskb_copy(skb, GFP_ATOMIC); einfo = rcu_dereference(e->info); - if (newskb) + if (newskb) { ieee802154_rx_irqsafe(e->endpoint->hw, newskb, einfo->lqi); + kfree_skb(newskb); + } } } rcu_read_unlock(); -- 2.25.1