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authorBaptiste Lepers <baptiste.lepers@gmail.com>2021-01-07 16:11:10 +1100
committerJakub Kicinski <kuba@kernel.org>2021-01-08 19:15:40 -0800
commitfd2ddef043592e7de80af53f47fa46fd3573086e (patch)
treefbd086182ba7049c4a7b6552809ee757b426a84f /net/core
parent53475c5dd856212e91538a9501162e821cc1f791 (diff)
udp: Prevent reuseport_select_sock from reading uninitialized socks
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: acdcecc61285f ("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>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/sock_reuseport.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/core/sock_reuseport.c b/net/core/sock_reuseport.c
index bbdd3c7b6cb5..b065f0a103ed 100644
--- a/net/core/sock_reuseport.c
+++ b/net/core/sock_reuseport.c
@@ -293,7 +293,7 @@ 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;