Re: [PATCH] bonding: move ipoib_header_ops to vmlinux

From: Wengang Wang <redacted>
Date: Tue, 25 Nov 2014 13:36:08 +0800

When last slave of a bonding master is removed, the bonding then does not work.
At the time if packet_snd is called against with a master net_device, it calls
then header_ops->create which points to slave's header_ops. In case the slave
is ipoib and the module is unloaded, header_ops would point to invalid address.
Accessing it will cause problem.
This patch tries to fix this issue by moving ipoib_header_ops to vmlinux to keep
it valid even when ipoib module is unloaded.

Signed-off-by: Wengang Wang <redacted>

IPOIB should not work over bonding as it requires that the device
use ARPHRD_ETHER.

Someone mentioned this, and I did not see any response.

Please show how a legitimate real bonding configuration can be
created, reproduce a stray memory access, and therefore potentially
cause a crash.

Using various debugging features of the kernel should allow you to
trigger an assertion quite easily if this bug really exists.
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