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| author | Eric Dumazet <edumazet@google.com> | 2025-02-07 13:58:40 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-02-21 14:01:43 +0100 |
| commit | 0bf8e2f3768629d437a32cb824149e6e98254381 (patch) | |
| tree | 762c6410243eda74989097f8abcec18c8c4beace /fs | |
| parent | 789230e5a8c1097301afc802e242c79bc8835c67 (diff) | |
| download | linux-0bf8e2f3768629d437a32cb824149e6e98254381.tar.gz linux-0bf8e2f3768629d437a32cb824149e6e98254381.tar.bz2 linux-0bf8e2f3768629d437a32cb824149e6e98254381.zip | |
ipv6: mcast: extend RCU protection in igmp6_send()
[ Upstream commit 087c1faa594fa07a66933d750c0b2610aa1a2946 ]
igmp6_send() can be called without RTNL or RCU being held.
Extend RCU protection so that we can safely fetch the net pointer
and avoid a potential UAF.
Note that we no longer can use sock_alloc_send_skb() because
ipv6.igmp_sk uses GFP_KERNEL allocations which can sleep.
Instead use alloc_skb() and charge the net->ipv6.igmp_sk
socket under RCU protection.
Fixes: b8ad0cbc58f7 ("[NETNS][IPV6] mcast - handle several network namespace")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20250207135841.1948589-9-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'fs')
0 files changed, 0 insertions, 0 deletions