diff options
author | Zefan Li <lizefan@huawei.com> | 2013-06-26 03:31:58 -0400 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2013-06-26 18:36:42 -0400 |
commit | 578a1310f2592ba90c5674bca21c1dbd1adf3f0a (patch) | |
tree | a8596ba1eeb67cfe8cd317822b83a76205b9ae6b /drivers/net/wan/dlci.c | |
parent | 11eb2645cbf38a08ae491bf6c602eea900ec0bb5 (diff) |
dlci: validate the net device in dlci_del()
We triggered an oops while running trinity with 3.4 kernel:
BUG: unable to handle kernel paging request at 0000000100000d07
IP: [<ffffffffa0109738>] dlci_ioctl+0xd8/0x2d4 [dlci]
PGD 640c0d067 PUD 0
Oops: 0000 [#1] PREEMPT SMP
CPU 3
...
Pid: 7302, comm: trinity-child3 Not tainted 3.4.24.09+ 40 Huawei Technologies Co., Ltd. Tecal RH2285 /BC11BTSA
RIP: 0010:[<ffffffffa0109738>] [<ffffffffa0109738>] dlci_ioctl+0xd8/0x2d4 [dlci]
...
Call Trace:
[<ffffffff8137c5c3>] sock_ioctl+0x153/0x280
[<ffffffff81195494>] do_vfs_ioctl+0xa4/0x5e0
[<ffffffff8118354a>] ? fget_light+0x3ea/0x490
[<ffffffff81195a1f>] sys_ioctl+0x4f/0x80
[<ffffffff81478b69>] system_call_fastpath+0x16/0x1b
...
It's because the net device is not a dlci device.
Reported-by: Li Jinyue <lijinyue@huawei.com>
Signed-off-by: Li Zefan <lizefan@huawei.com>
Cc: stable@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/wan/dlci.c')
-rw-r--r-- | drivers/net/wan/dlci.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/net/wan/dlci.c b/drivers/net/wan/dlci.c index 1f6e0538c716..6a8a382c5f4c 100644 --- a/drivers/net/wan/dlci.c +++ b/drivers/net/wan/dlci.c | |||
@@ -384,6 +384,7 @@ static int dlci_del(struct dlci_add *dlci) | |||
384 | struct frad_local *flp; | 384 | struct frad_local *flp; |
385 | struct net_device *master, *slave; | 385 | struct net_device *master, *slave; |
386 | int err; | 386 | int err; |
387 | bool found = false; | ||
387 | 388 | ||
388 | rtnl_lock(); | 389 | rtnl_lock(); |
389 | 390 | ||
@@ -394,6 +395,17 @@ static int dlci_del(struct dlci_add *dlci) | |||
394 | goto out; | 395 | goto out; |
395 | } | 396 | } |
396 | 397 | ||
398 | list_for_each_entry(dlp, &dlci_devs, list) { | ||
399 | if (dlp->master == master) { | ||
400 | found = true; | ||
401 | break; | ||
402 | } | ||
403 | } | ||
404 | if (!found) { | ||
405 | err = -ENODEV; | ||
406 | goto out; | ||
407 | } | ||
408 | |||
397 | if (netif_running(master)) { | 409 | if (netif_running(master)) { |
398 | err = -EBUSY; | 410 | err = -EBUSY; |
399 | goto out; | 411 | goto out; |