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| author | Tao Ma <boyu.mt@taobao.com> | 2011-04-05 00:00:49 +0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2011-04-05 00:00:49 +0400 |
| commit | 46e4690bbd9a4f8d9e7c4f34e34b48f703ad47e0 (patch) | |
| tree | 94d800c75ed4a9e11cd5301e171d301b266d4032 /fs/ext4/super.c | |
| parent | 5b41395fcc0265fc9f193aef9df39ce49d64677c (diff) | |
| download | linux-46e4690bbd9a4f8d9e7c4f34e34b48f703ad47e0.tar.xz | |
ext4: fix a double free in ext4_register_li_request
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>
Cc: stable@kernel.org
Diffstat (limited to 'fs/ext4/super.c')
| -rw-r--r-- | fs/ext4/super.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 35ff9fef68bd..35bd0206bbb3 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -2975,6 +2975,12 @@ 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(); |