diff options
| author | Zheyu Ma <zheyuma97@gmail.com> | 2021-10-14 09:28:33 +0300 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2021-10-17 23:51:50 +0300 |
| commit | 949fe9b35570361bc6ee2652f89a0561b26eec98 (patch) | |
| tree | a3990f56ed14dd8d352028b7f21cbdc45d505f20 /drivers/net | |
| parent | 99d173fbe8944861a00ebd1c73817a1260d21e60 (diff) | |
| download | linux-949fe9b35570361bc6ee2652f89a0561b26eec98.tar.xz | |
can: peak_pci: peak_pci_remove(): fix UAF
When remove the module peek_pci, referencing 'chan' again after
releasing 'dev' will cause UAF.
Fix this by releasing 'dev' later.
The following log reveals it:
[ 35.961814 ] BUG: KASAN: use-after-free in peak_pci_remove+0x16f/0x270 [peak_pci]
[ 35.963414 ] Read of size 8 at addr ffff888136998ee8 by task modprobe/5537
[ 35.965513 ] Call Trace:
[ 35.965718 ] dump_stack_lvl+0xa8/0xd1
[ 35.966028 ] print_address_description+0x87/0x3b0
[ 35.966420 ] kasan_report+0x172/0x1c0
[ 35.966725 ] ? peak_pci_remove+0x16f/0x270 [peak_pci]
[ 35.967137 ] ? trace_irq_enable_rcuidle+0x10/0x170
[ 35.967529 ] ? peak_pci_remove+0x16f/0x270 [peak_pci]
[ 35.967945 ] __asan_report_load8_noabort+0x14/0x20
[ 35.968346 ] peak_pci_remove+0x16f/0x270 [peak_pci]
[ 35.968752 ] pci_device_remove+0xa9/0x250
Fixes: e6d9c80b7ca1 ("can: peak_pci: add support of some new PEAK-System PCI cards")
Link: https://lore.kernel.org/all/1634192913-15639-1-git-send-email-zheyuma97@gmail.com
Cc: stable@vger.kernel.org
Signed-off-by: Zheyu Ma <zheyuma97@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/can/sja1000/peak_pci.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/drivers/net/can/sja1000/peak_pci.c b/drivers/net/can/sja1000/peak_pci.c index 6db90dc4bc9d..84f34020aafb 100644 --- a/drivers/net/can/sja1000/peak_pci.c +++ b/drivers/net/can/sja1000/peak_pci.c @@ -752,16 +752,15 @@ static void peak_pci_remove(struct pci_dev *pdev) struct net_device *prev_dev = chan->prev_dev; dev_info(&pdev->dev, "removing device %s\n", dev->name); + /* do that only for first channel */ + if (!prev_dev && chan->pciec_card) + peak_pciec_remove(chan->pciec_card); unregister_sja1000dev(dev); free_sja1000dev(dev); dev = prev_dev; - if (!dev) { - /* do that only for first channel */ - if (chan->pciec_card) - peak_pciec_remove(chan->pciec_card); + if (!dev) break; - } priv = netdev_priv(dev); chan = priv->priv; } |