From: Pravin B Shelar Date: Fri, 23 Mar 2012 22:02:55 +0000 (-0700) Subject: proc-ns: use d_set_d_op() API to set dentry ops in proc_ns_instantiate(). X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1b26c9b334044cff6d1d2698f2be41bc7d9a0864;p=mv-sheeva.git proc-ns: use d_set_d_op() API to set dentry ops in proc_ns_instantiate(). The namespace cleanup path leaks a dentry which holds a reference count on a network namespace. Keeping that network namespace from being freed when the last user goes away. Leaving things like vlan devices in the leaked network namespace. If you use ip netns add for much real work this problem becomes apparent pretty quickly. It light testing the problem hides because frequently you simply don't notice the leak. Use d_set_d_op() so that DCACHE_OP_* flags are set correctly. This issue exists back to 3.0. Acked-by: "Eric W. Biederman" Reported-by: Justin Pettit Signed-off-by: Pravin B Shelar Signed-off-by: Jesse Gross Cc: David Miller Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/fs/proc/namespaces.c b/fs/proc/namespaces.c index 27da860115c..3551f1f839e 100644 --- a/fs/proc/namespaces.c +++ b/fs/proc/namespaces.c @@ -53,7 +53,7 @@ static struct dentry *proc_ns_instantiate(struct inode *dir, ei->ns_ops = ns_ops; ei->ns = ns; - dentry->d_op = &pid_dentry_operations; + d_set_d_op(dentry, &pid_dentry_operations); d_add(dentry, inode); /* Close the race of the process dying before we return the dentry */ if (pid_revalidate(dentry, NULL))