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inet: shrink struct flowi_common

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[ Upstream commit 1726483b79 ]

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: 24ba14406c ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Eric Dumazet 2023-10-25 14:10:37 +00:00 committed by Greg Kroah-Hartman
parent 89d92e4fc5
commit 612c22e928
1 changed files with 1 additions and 1 deletions
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2
include/net/flow.h
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@ -39,8 +39,8 @@ 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 {