From: Josh Elsasser Date: Sat, 26 Jan 2019 22:38:33 +0000 (-0800) Subject: net: set default network namespace in init_dummy_netdev() X-Git-Tag: rel_imx_4.19.35_1.1.0~6935 X-Git-Url: https://git.somdevices.com/?a=commitdiff_plain;h=5f1a18e05b07913c9e26f5fe3c41fa56679d6c31;p=linux.git net: set default network namespace in init_dummy_netdev() [ Upstream commit 35edfdc77f683c8fd27d7732af06cf6489af60a5 ] Assign a default net namespace to netdevs created by init_dummy_netdev(). Fixes a NULL pointer dereference caused by busy-polling a socket bound to an iwlwifi wireless device, which bumps the per-net BUSYPOLLRXPACKETS stat if napi_poll() received packets: BUG: unable to handle kernel NULL pointer dereference at 0000000000000190 IP: napi_busy_loop+0xd6/0x200 Call Trace: sock_poll+0x5e/0x80 do_sys_poll+0x324/0x5a0 SyS_poll+0x6c/0xf0 do_syscall_64+0x6b/0x1f0 entry_SYSCALL_64_after_hwframe+0x3d/0xa2 Fixes: 7db6b048da3b ("net: Commonize busy polling code to focus on napi_id instead of socket") Signed-off-by: Josh Elsasser Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- diff --git a/net/core/dev.c b/net/core/dev.c index 1f1aae27d41f..af097ca9cb4f 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -8599,6 +8599,9 @@ int init_dummy_netdev(struct net_device *dev) set_bit(__LINK_STATE_PRESENT, &dev->state); set_bit(__LINK_STATE_START, &dev->state); + /* napi_busy_loop stats accounting wants this */ + dev_net_set(dev, &init_net); + /* Note : We dont allocate pcpu_refcnt for dummy devices, * because users of this 'device' dont need to change * its refcount.