bpf, sockhash: Synchronize_rcu before free'ing map

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[ Upstream commit 0b2dc83906 ]

We need to have a synchronize_rcu before free'ing the sockhash because any
outstanding psock references will have a pointer to the map and when they
use it, this could trigger a use after free.

This is a sister fix for sockhash, following commit 2bb90e5cc9 ("bpf:
sockmap, synchronize_rcu before free'ing map") which addressed sockmap,
which comes from a manual audit.

Fixes: 604326b41a ("bpf, sockmap: convert to generic sk_msg interface")
Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20200206111652.694507-3-jakub@cloudflare.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Jakub Sitnicki 2020-02-06 12:16:51 +01:00 • committed by Greg Kroah-Hartman

parent 4daa2141cf

commit e028271bb2

1 changed files with 3 additions and 0 deletions

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net/core/sock_map.c

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