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ipvs: do not propagate one-packet flag to synced conns

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commit a63d2dbaeb upstream.

Synced connections can be created before their destination exists. When
the destination is later added, ip_vs_bind_dest() copies connection flags
from the destination into cp->flags.

IP_VS_CONN_F_ONE_PACKET connections are not synced. If a synced
connection inherits IP_VS_CONN_F_ONE_PACKET while it is already hashed,
expiry can treat it as a one-packet connection and skip unlinking the
existing conn_tab node, leaving stale hash nodes pointing at a freed
struct ip_vs_conn.

Drop IP_VS_CONN_F_ONE_PACKET from destination flags when binding synced
connections.

Fixes: 26ec037f98 ("IPVS: one-packet scheduling")
Cc: stable@vger.kernel.org
Reported-by: Yuan Tan <yuantan098@gmail.com>
Reported-by: Yifan Wu <yifanwucs@gmail.com>
Reported-by: Juefei Pu <tomapufckgml@gmail.com>
Reported-by: Xin Liu <bird@lzu.edu.cn>
Suggested-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Zhiling Zou <roxy520tt@gmail.com>
Signed-off-by: Ren Wei <n05ec@lzu.edu.cn>
Acked-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Zhiling Zou
2026-08-09 20:21:53 +02:00
committed by Greg Kroah-Hartman
parent 31089f4eab
commit 44af98cc7d
1 changed files with 3 additions and 0 deletions
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net/netfilter/ipvs/ip_vs_conn.c
+3
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@@ -598,6 +598,9 @@ ip_vs_bind_dest(struct ip_vs_conn *cp, struct ip_vs_dest *dest)
flags = cp->flags;
/* Bind with the destination and its corresponding transmitter */
if (flags & IP_VS_CONN_F_SYNC) {
/* Synced conns are hashed, so they can not get this flag */
conn_flags &= ~IP_VS_CONN_F_ONE_PACKET;
/* if the connection is not template and is created
* by sync, preserve the activity flag.
*/