UPSTREAM: neighbour: fix unaligned access to pneigh_entry

[ Upstream commit ed779fe4 ]

After the blamed commit, the member key is longer 4-byte aligned. On
platforms that do not support unaligned access, e.g., MIPS32R2 with
unaligned_action set to 1, this will trigger a crash when accessing
an IPv6 pneigh_entry, as the key is cast to an in6_addr pointer.

Change the type of the key to u32 to make it aligned.

Fixes: 62dd9318 ("[IPV6] NDISC: Set per-entry is_router flag in Proxy NA.")
Change-Id: I51f20602275108df08d17710c24aad9ee42fc1db
Signed-off-by: Qingfang DENG <qingfang.deng@siflower.com.cn>
Link: https://lore.kernel.org/r/20230601015432.159066-1-dqfext@gmail.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit ab0eca3f)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>