From ce285c267a003acbf607f3540ff71287f82e5282 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Tue, 2 Apr 2019 15:17:34 -0400 Subject: autofs: fix use-after-free in lockless ->d_manage() autofs_d_release() can overlap with lockless ->d_manage(), ending up with autofs_dentry_ino() freed under the latter. Make freeing autofs_info instances RCU-delayed... Signed-off-by: Al Viro --- fs/autofs/autofs_i.h | 1 + fs/autofs/inode.c | 2 +- 2 files changed, 2 insertions(+), 1 deletion(-) (limited to 'fs/autofs') diff --git a/fs/autofs/autofs_i.h b/fs/autofs/autofs_i.h index 70c132acdab1..e1091312abe1 100644 --- a/fs/autofs/autofs_i.h +++ b/fs/autofs/autofs_i.h @@ -71,6 +71,7 @@ struct autofs_info { kuid_t uid; kgid_t gid; + struct rcu_head rcu; }; #define AUTOFS_INF_EXPIRING (1<<0) /* dentry in the process of expiring */ diff --git a/fs/autofs/inode.c b/fs/autofs/inode.c index 80597b88718b..fb0225f21c12 100644 --- a/fs/autofs/inode.c +++ b/fs/autofs/inode.c @@ -36,7 +36,7 @@ void autofs_clean_ino(struct autofs_info *ino) void autofs_free_ino(struct autofs_info *ino) { - kfree(ino); + kfree_rcu(ino, rcu); } void autofs_kill_sb(struct super_block *sb) -- cgit v1.2.3-55-g7522