Thread (4 messages) 4 messages, 3 authors, 2024-10-29
STALE625d

[PATCH net] netlink: Fix off-by-one error in netlink_proto_init()

From: Jinjie Ruan <hidden>
Date: 2024-10-28 08:05:51
Also in: lkml
Subsystem: networking [general], the rest · Maintainers: "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds

In the error path of netlink_proto_init(), frees the already allocated
bucket table for new hash tables in a loop, but the loop condition
terminates when the index reaches zero, which fails to free the first
bucket table at index zero.

Check for >= 0 so that nl_table[0].hash is freed as well.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Jinjie Ruan <redacted>
---
 net/netlink/af_netlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 0a9287fadb47..9601b85dda95 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -2936,7 +2936,7 @@ static int __init netlink_proto_init(void)
 	for (i = 0; i < MAX_LINKS; i++) {
 		if (rhashtable_init(&nl_table[i].hash,
 				    &netlink_rhashtable_params) < 0) {
-			while (--i > 0)
+			while (--i >= 0)
 				rhashtable_destroy(&nl_table[i].hash);
 			kfree(nl_table);
 			goto panic;
-- 
2.34.1
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