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udp: Prevent reuseport_select_sock from reading uninitialized socks

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[ Upstream commit fd2ddef043592e7de80af53f47fa46fd3573086e ]

reuse->socks[] is modified concurrently by reuseport_add_sock. To
prevent reading values that have not been fully initialized, only read
the array up until the last known safe index instead of incorrectly
re-reading the last index of the array.

Fixes: acdcecc612 ("udp: correct reuseport selection with connected sockets")
Signed-off-by: Baptiste Lepers <baptiste.lepers@gmail.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/r/20210107051110.12247-1-baptiste.lepers@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Baptiste Lepers 2021-01-07 16:11:10 +11:00 • committed by Greg Kroah-Hartman
commit 982e763ea3
1 changed files with 1 additions and 1 deletions
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2
net/core/sock_reuseport.c
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@ -302,7 +302,7 @@ select_by_hash:
i = j = reciprocal_scale(hash, socks);
while (reuse->socks[i]->sk_state == TCP_ESTABLISHED) {
i++;
if (i >= reuse->num_socks)
if (i >= socks)
i = 0;
if (i == j)
goto out;