Re: [PATCH net] net: nexthop: fix null pointer dereference when IPv6 is not enabled

Hello:

This patch was applied to netdev/net.git (master)
by David S. Miller [off-list ref]:

On Tue, 23 Nov 2021 12:27:19 +0200 you wrote:

From: Nikolay Aleksandrov <redacted>

When we try to add an IPv6 nexthop and IPv6 is not enabled
(!CONFIG_IPV6) we'll hit a NULL pointer dereference[1] in the error path
of nh_create_ipv6() due to calling ipv6_stub->fib6_nh_release. The bug
has been present since the beginning of IPv6 nexthop gateway support.
Commit 1aefd3de7bc6 ("ipv6: Add fib6_nh_init and release to stubs") tells
us that only fib6_nh_init has a dummy stub because fib6_nh_release should
not be called if fib6_nh_init returns an error, but the commit below added
a call to ipv6_stub->fib6_nh_release in its error path. To fix it return
the dummy stub's -EAFNOSUPPORT error directly without calling
ipv6_stub->fib6_nh_release in nh_create_ipv6()'s error path.

[...]

Here is the summary with links:
  - [net] net: nexthop: fix null pointer dereference when IPv6 is not enabled
    https://git.kernel.org/netdev/net/c/1c743127cc54

You are awesome, thank you!
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