From 1726483b79a72e0150734d5367e4a0238bf8fcff Mon Sep 17 00:00:00 2001
From: Eric Dumazet <edumazet@google.com>
Date: Wed, 25 Oct 2023 14:10:37 +0000
Subject: [PATCH] inet: shrink struct flowi_common
I am looking at syzbot reports triggering kernel stack overflows
involving a cascade of ipvlan devices.
We can save 8 bytes in struct flowi_common.
This patch alone will not fix the issue, but is a start.
Fixes: 24ba14406c5c ("route: Add multipath_hash in flowi_common to make user-define hash")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: wenxu <wenxu@ucloud.cn>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20231025141037.3448203-1-edumazet@google.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---
include/net/flow.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/net/flow.h b/include/net/flow.h
index 7f0adda3bf2fe..335bbc52171c1 100644
--- a/include/net/flow.h
+++ b/include/net/flow.h
@@ -40,8 +40,8 @@ struct flowi_common {
#define FLOWI_FLAG_KNOWN_NH 0x02
__u32 flowic_secid;
kuid_t flowic_uid;
- struct flowi_tunnel flowic_tun_key;
__u32 flowic_multipath_hash;
+ struct flowi_tunnel flowic_tun_key;
};
union flowi_uli {
--
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