From: Pavel Skripkin paskripkin@gmail.com
mainline inclusion from mainline-v5.13-rc4 commit 46a8b29c6306d8bbfd92b614ef65a47c900d8e70 category: bugfix bugzilla: 189719 CVE: CVE-2021-47171
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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Syzbot reported memory leak in smsc75xx_bind(). The problem was is non-freed memory in case of errors after memory allocation.
backtrace: [<ffffffff84245b62>] kmalloc include/linux/slab.h:556 [inline] [<ffffffff84245b62>] kzalloc include/linux/slab.h:686 [inline] [<ffffffff84245b62>] smsc75xx_bind+0x7a/0x334 drivers/net/usb/smsc75xx.c:1460 [<ffffffff82b5b2e6>] usbnet_probe+0x3b6/0xc30 drivers/net/usb/usbnet.c:1728
Fixes: d0cad871703b ("smsc75xx: SMSC LAN75xx USB gigabit ethernet adapter driver") Cc: stable@kernel.vger.org Reported-and-tested-by: syzbot+b558506ba8165425fee2@syzkaller.appspotmail.com Signed-off-by: Pavel Skripkin paskripkin@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Luo Gengkun luogengkun2@huawei.com --- drivers/net/usb/smsc75xx.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/net/usb/smsc75xx.c b/drivers/net/usb/smsc75xx.c index ef8589e3a6d1..15cc5e4acaa5 100644 --- a/drivers/net/usb/smsc75xx.c +++ b/drivers/net/usb/smsc75xx.c @@ -1497,7 +1497,7 @@ static int smsc75xx_bind(struct usbnet *dev, struct usb_interface *intf) ret = smsc75xx_wait_ready(dev, 0); if (ret < 0) { netdev_warn(dev->net, "device not ready in smsc75xx_bind\n"); - return ret; + goto err; }
smsc75xx_init_mac_address(dev); @@ -1506,7 +1506,7 @@ static int smsc75xx_bind(struct usbnet *dev, struct usb_interface *intf) ret = smsc75xx_reset(dev); if (ret < 0) { netdev_warn(dev->net, "smsc75xx_reset error %d\n", ret); - return ret; + goto err; }
dev->net->netdev_ops = &smsc75xx_netdev_ops; @@ -1516,6 +1516,10 @@ static int smsc75xx_bind(struct usbnet *dev, struct usb_interface *intf) dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len; dev->net->max_mtu = MAX_SINGLE_PACKET_SIZE; return 0; + +err: + kfree(pdata); + return ret; }
static void smsc75xx_unbind(struct usbnet *dev, struct usb_interface *intf)
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From: Dongliang Mu mudongliangabcd@gmail.com
mainline inclusion from mainline-v5.13-rc7 commit 56b786d86694e079d8aad9b314e015cd4ac02a3d category: bugfix bugzilla: 189719 CVE: CVE-2021-47171
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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The commit 46a8b29c6306 ("net: usb: fix memory leak in smsc75xx_bind") fails to clean up the work scheduled in smsc75xx_reset-> smsc75xx_set_multicast, which leads to use-after-free if the work is scheduled to start after the deallocation. In addition, this patch also removes a dangling pointer - dev->data[0].
This patch calls cancel_work_sync to cancel the scheduled work and set the dangling pointer to NULL.
Fixes: 46a8b29c6306 ("net: usb: fix memory leak in smsc75xx_bind") Signed-off-by: Dongliang Mu mudongliangabcd@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Luo Gengkun luogengkun2@huawei.com --- drivers/net/usb/smsc75xx.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/net/usb/smsc75xx.c b/drivers/net/usb/smsc75xx.c index 15cc5e4acaa5..dea72fa04958 100644 --- a/drivers/net/usb/smsc75xx.c +++ b/drivers/net/usb/smsc75xx.c @@ -1497,7 +1497,7 @@ static int smsc75xx_bind(struct usbnet *dev, struct usb_interface *intf) ret = smsc75xx_wait_ready(dev, 0); if (ret < 0) { netdev_warn(dev->net, "device not ready in smsc75xx_bind\n"); - goto err; + goto free_pdata; }
smsc75xx_init_mac_address(dev); @@ -1506,7 +1506,7 @@ static int smsc75xx_bind(struct usbnet *dev, struct usb_interface *intf) ret = smsc75xx_reset(dev); if (ret < 0) { netdev_warn(dev->net, "smsc75xx_reset error %d\n", ret); - goto err; + goto cancel_work; }
dev->net->netdev_ops = &smsc75xx_netdev_ops; @@ -1517,8 +1517,11 @@ static int smsc75xx_bind(struct usbnet *dev, struct usb_interface *intf) dev->net->max_mtu = MAX_SINGLE_PACKET_SIZE; return 0;
-err: +cancel_work: + cancel_work_sync(&pdata->set_multicast); +free_pdata: kfree(pdata); + dev->data[0] = 0; return ret; }
@@ -1529,7 +1532,6 @@ static void smsc75xx_unbind(struct usbnet *dev, struct usb_interface *intf) cancel_work_sync(&pdata->set_multicast); netif_dbg(dev, ifdown, dev->net, "free pdata\n"); kfree(pdata); - pdata = NULL; dev->data[0] = 0; } }
-
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