Re: [PATCH] set fake_rtable's dst to NULL to avoid kernel Oops.

From: Jonathan Nieder
Date: Wed Apr 18 2012 - 15:04:56 EST


Peter Huang (Peng) wrote:

> When bridge is deleted before tap/vif device's delete, kernel may
> encounter an oops because of NULL reference to fake_rtable's dst.
> Set fake_rtable's dst to NULL before sending packets out can solve
> this problem.
> Acked-by: Eric Dumazet <eric.dumazet@xxxxxxxxx>
> Signed-off-by: Peter Huang <peter.huangpeng@xxxxxxxxxx>
> ---
> include/linux/netfilter_bridge.h | 8 ++++++++
> net/bridge/br_forward.c | 1 +
> net/bridge/br_netfilter.c | 6 +-----
> 3 files changed, 10 insertions(+), 5 deletions(-)

Massimo Cetra (cc-ed) tested the patch against a 3.2.y kernel and wrote[1]:

> The patch i applied yesterday to the debian kernel has been installed
> and the kernel is not panic-ing anymore.
> I'll try to keep this bug up to date.

So it seems to work. Dave, please consider queuing this for stable@
when the final patch is ready.


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