[ Upstream commit 46c874419652bbefdfed17420fd6e88d8a31d9ec ]
symlink body shouldn't be freed without an RCU delay. Switch securityfs to ->destroy_inode() and use of call_rcu(); free both the inode and symlink body in the callback.
Signed-off-by: Al Viro viro@zeniv.linux.org.uk Signed-off-by: Sasha Levin sashal@kernel.org --- security/inode.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/security/inode.c b/security/inode.c index 8dd9ca8848e43..829f15672e01f 100644 --- a/security/inode.c +++ b/security/inode.c @@ -26,17 +26,22 @@ static struct vfsmount *mount; static int mount_count;
-static void securityfs_evict_inode(struct inode *inode) +static void securityfs_i_callback(struct rcu_head *head) { - truncate_inode_pages_final(&inode->i_data); - clear_inode(inode); + struct inode *inode = container_of(head, struct inode, i_rcu); if (S_ISLNK(inode->i_mode)) kfree(inode->i_link); + free_inode_nonrcu(inode); +} + +static void securityfs_destroy_inode(struct inode *inode) +{ + call_rcu(&inode->i_rcu, securityfs_i_callback); }
static const struct super_operations securityfs_super_operations = { .statfs = simple_statfs, - .evict_inode = securityfs_evict_inode, + .destroy_inode = securityfs_destroy_inode, };
static int fill_super(struct super_block *sb, void *data, int silent)