This is a note to let you know that I've just added the patch titled
dlci: validate the net device in dlci_del()
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dlci-validate-the-net-device-in-dlci_del.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 578a1310f2592ba90c5674bca21c1dbd1adf3f0a Mon Sep 17 00:00:00 2001
From: Zefan Li <lizefan@xxxxxxxxxx>
Date: Wed, 26 Jun 2013 15:31:58 +0800
Subject: dlci: validate the net device in dlci_del()
From: Zefan Li <lizefan@xxxxxxxxxx>
commit 578a1310f2592ba90c5674bca21c1dbd1adf3f0a upstream.
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@xxxxxxxxxx>
Signed-off-by: Li Zefan <lizefan@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/wan/dlci.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
--- a/drivers/net/wan/dlci.c
+++ b/drivers/net/wan/dlci.c
@@ -384,6 +384,7 @@ static int dlci_del(struct dlci_add *dlc
struct frad_local *flp;
struct net_device *master, *slave;
int err;
+ bool found = false;
rtnl_lock();
@@ -393,6 +394,17 @@ static int dlci_del(struct dlci_add *dlc
err = -ENODEV;
goto out;
}
+
+ list_for_each_entry(dlp, &dlci_devs, list) {
+ if (dlp->master == master) {
+ found = true;
+ break;
+ }
+ }
+ if (!found) {
+ err = -ENODEV;
+ goto out;
+ }
if (netif_running(master)) {
err = -EBUSY;
Patches currently in stable-queue which might be from lizefan@xxxxxxxxxx are
queue-3.4/dlci-acquire-rtnl_lock-before-calling-__dev_get_by_name.patch
queue-3.4/dlci-validate-the-net-device-in-dlci_del.patch
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