tcp: fix race in tcp_v6_syn_recv_sock()

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[ Upstream commit d37fe4255a ]

tcp_v6_syn_recv_sock() calls ip6_dst_store() before
inet_sk(newsk)->pinet6 has been set up.

This means ip6_dst_store() writes over the parent (listener)
np->dst_cookie.

This is racy because multiple threads could share the same
parent and their final np->dst_cookie could be wrong.

Move ip6_dst_store() call after inet_sk(newsk)->pinet6
has been changed and after the copy of parent ipv6_pinfo.

Fixes: e994b2f0fb ("tcp: do not lock listener to process SYN packets")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Eric Dumazet 2024-06-06 15:46:51 +00:00 • committed by Greg Kroah-Hartman

parent b5c8ffc8cf

commit d61808ac99

1 changed files with 2 additions and 1 deletions

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net/ipv6/tcp_ipv6.c

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