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Message-ID: <1398048952-7825-9-git-send-email-ying.xue@windriver.com> Date: Mon, 21 Apr 2014 10:55:49 +0800 From: Ying Xue <ying.xue@...driver.com> To: <davem@...emloft.net> CC: <jon.maloy@...csson.com>, <Paul.Gortmaker@...driver.com>, <erik.hugne@...csson.com>, <netdev@...r.kernel.org>, <tipc-discussion@...ts.sourceforge.net> Subject: [PATCH net-next 08/11] tipc: make media_ptr pointed netdevice valid The 'media_ptr' pointer in bearer structure which points to network device, is protected by RCU. So, before netdevice is released, synchronize_net() should be involved to prevent no any user of the netdevice on read side from accessing it after it is freed. Signed-off-by: Ying Xue <ying.xue@...driver.com> Reviewed-by: Jon Maloy <jon.maloy@...csson.com> Reviewed-by: Erik Hugne <erik.hugne@...csson.com> Tested-by: Erik Hugne <erik.hugne@...csson.com> --- net/tipc/bearer.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c index 1bd96eb..402e994 100644 --- a/net/tipc/bearer.c +++ b/net/tipc/bearer.c @@ -471,6 +471,7 @@ void tipc_disable_l2_media(struct tipc_bearer *b) dev = (struct net_device *)rtnl_dereference(b->media_ptr); RCU_INIT_POINTER(b->media_ptr, NULL); RCU_INIT_POINTER(dev->tipc_ptr, NULL); + synchronize_net(); dev_put(dev); } -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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