[PATCH 4.4 15/40] f2fs: fix a panic caused by NULL flush_cmd_control

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Yunlei He <heyun...@huawei.com>

commit d4fdf8ba0e5808ba9ad6b44337783bd9935e0982 upstream.

Mount fs with option noflush_merge, boot failed for illegal address
fcc in function f2fs_issue_flush:

        if (!test_opt(sbi, FLUSH_MERGE)) {
                ret = submit_flush_wait(sbi);
                atomic_inc(&fcc->issued_flush);   ->  Here, fcc illegal
                return ret;
        }

Signed-off-by: Yunlei He <heyun...@huawei.com>
Signed-off-by: Jaegeuk Kim <jaeg...@kernel.org>
[bwh: Backported to 4.9: adjust context]
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 fs/f2fs/segment.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -398,6 +398,9 @@ int create_flush_cmd_control(struct f2fs
        init_waitqueue_head(&fcc->flush_wait_queue);
        init_llist_head(&fcc->issue_list);
        SM_I(sbi)->cmd_control_info = fcc;
+       if (!test_opt(sbi, FLUSH_MERGE))
+               return err;
+
        fcc->f2fs_issue_flush = kthread_run(issue_flush_thread, sbi,
                                "f2fs_flush-%u:%u", MAJOR(dev), MINOR(dev));
        if (IS_ERR(fcc->f2fs_issue_flush)) {
@@ -2316,7 +2319,7 @@ int build_segment_manager(struct f2fs_sb
 
        INIT_LIST_HEAD(&sm_info->sit_entry_set);
 
-       if (test_opt(sbi, FLUSH_MERGE) && !f2fs_readonly(sbi->sb)) {
+       if (!f2fs_readonly(sbi->sb)) {
                err = create_flush_cmd_control(sbi);
                if (err)
                        return err;