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ceph: fix use-after-free on symlink traversal 

free the symlink body after the same RCU delay we have for freeing the
struct inode itself, so that traversal during RCU pathwalk wouldn't step
into freed memory.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Al Viro 2019-03-26 01:38:58 +00:00 committed by Ilya Dryomov
parent 187df76325
commit daf5cc27ee
1 changed files with 1 additions and 1 deletions
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2
fs/ceph/inode.c
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@ -524,6 +524,7 @@ static void ceph_i_callback(struct rcu_head *head)
struct inode *inode = container_of(head, struct inode, i_rcu);
struct ceph_inode_info *ci = ceph_inode(inode);
kfree(ci->i_symlink);
kmem_cache_free(ceph_inode_cachep, ci);
}
@ -566,7 +567,6 @@ void ceph_destroy_inode(struct inode *inode)
}
}
kfree(ci->i_symlink);
while ((n = rb_first(&ci->i_fragtree)) != NULL) {
frag = rb_entry(n, struct ceph_inode_frag, node);
rb_erase(n, &ci->i_fragtree);