ip6mr: fix tables suspicious RCU usage

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[ Upstream commit f1553c9894 ]

Several places call ip6mr_get_table() with no RCU nor RTNL lock.
Add RCU protection inside such helper and provide a lockless variant
for the few callers that already acquired the relevant lock.

Note that some users additionally reference the table outside the RCU
lock. That is actually safe as the table deletion can happen only
after all table accesses are completed.

Fixes: e2d57766e6 ("net: Provide compat support for SIOCGETMIFCNT_IN6 and SIOCGETSGCNT_IN6.")
Fixes: d7c31cbde4 ("net: ip6mr: add RTM_GETROUTE netlink op")
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Paolo Abeni 2024-11-24 16:40:57 +01:00 • committed by Greg Kroah-Hartman

parent 9a3c1ad93e

commit 5e656d0565

1 changed files with 27 additions and 11 deletions

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net/ipv6/ip6mr.c

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