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.lep...@gmail.com>
---
net/core/sock_reuseport.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
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 @@ struct sock *reuseport_select_sock(struct sock *sk,
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;
--
2.17.1
