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authorAl Viro <viro@zeniv.linux.org.uk>2019-03-26 01:40:38 +0000
committerAl Viro <viro@zeniv.linux.org.uk>2019-04-01 00:31:02 -0400
commit0cdc17ebd2072b6cdd3ec3695ea7ede745664a8b (patch)
tree7feee598cba29b9c9adf1a3d7c4e9548860a24f3 /fs
parent4fdcfab5b5537c21891e22e65996d4d0dd8ab4ca (diff)
downloadlinux-stericsson-0cdc17ebd2072b6cdd3ec3695ea7ede745664a8b.tar.gz
ubifs: 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>
Diffstat (limited to 'fs')
-rw-r--r--fs/ubifs/super.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 8dc2818fdd84..12628184772c 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -276,14 +276,12 @@ static void ubifs_i_callback(struct rcu_head *head)
{
struct inode *inode = container_of(head, struct inode, i_rcu);
struct ubifs_inode *ui = ubifs_inode(inode);
+ kfree(ui->data);
kmem_cache_free(ubifs_inode_slab, ui);
}
static void ubifs_destroy_inode(struct inode *inode)
{
- struct ubifs_inode *ui = ubifs_inode(inode);
-
- kfree(ui->data);
call_rcu(&inode->i_rcu, ubifs_i_callback);
}