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authorEric Dumazet <edumazet@google.com>2022-02-16 21:20:37 +0300
committerJakub Kicinski <kuba@kernel.org>2022-02-17 19:41:54 +0300
commitbe6b41c15dc09c067492bd23668763f551747e4e (patch)
tree3326aea689f69ff1392b14ac63d47bc27b0fd044 /net/ipv4/fib_semantics.c
parentfaab39f63c1fc4bcdf135690f03bd596b578c67e (diff)
downloadlinux-be6b41c15dc09c067492bd23668763f551747e4e.tar.xz
ipv6/addrconf: ensure addrconf_verify_rtnl() has completed
Before freeing the hash table in addrconf_exit_net(), we need to make sure the work queue has completed, or risk NULL dereference or UAF. Thus, use cancel_delayed_work_sync() to enforce this. We do not hold RTNL in addrconf_exit_net(), making this safe. Fixes: 8805d13ff1b2 ("ipv6/addrconf: use one delayed work per netns") Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: syzbot <syzkaller@googlegroups.com> Reviewed-by: David Ahern <dsahern@kernel.org> Link: https://lore.kernel.org/r/20220216182037.3742-1-eric.dumazet@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/ipv4/fib_semantics.c')
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