ext4: fix a double free in ext4_register_li_request

BugLink: http://bugs.launchpad.net/bugs/761134

commit 46e4690bbd9a4f8d9e7c4f34e34b48f703ad47e0 upstream.

In ext4_register_li_request, we malloc a ext4_li_request and
inserts it into ext4_li_info->li_request_list. In case of any
error later, we free it in the end.  But if we have some error
in ext4_run_lazyinit_thread, the whole li_request_list will be
dropped and freed in it. So we will double free this ext4_li_request.

This patch just sets elr to NULL after it is inserted to the list
so that the latter kfree won't double free it.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Reviewed-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 4381efe..243deb0 100644 (file)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2978,6 +2978,12 @@ static int ext4_register_li_request(struct super_block *sb,
        mutex_unlock(&ext4_li_info->li_list_mtx);
 
        sbi->s_li_request = elr;
+       /*
+        * set elr to NULL here since it has been inserted to
+        * the request_list and the removal and free of it is
+        * handled by ext4_clear_request_list from now on.
+        */
+       elr = NULL;
 
        if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
                ret = ext4_run_lazyinit_thread();