Re: [PATCH] f2fs: fix a panic caused by NULL flush_cmd_control

On Sat, Dec 15, 2018 at 06:21:54PM +0100, Loic wrote:

Hello,

Please picked up this patch for linux 4.4. This fixes CVE-2017-18241. This has been fixed in linux 4.9.144.

Thank.

[ Upstream commit d4fdf8ba0e5808ba9ad6b44337783bd9935e0982 ]

From: Yunlei He heyunlei@huawei.com Date: Thu, 1 Jun 2017 16:43:51 +0800 Subject: [PATCH] f2fs: fix a panic caused by NULL flush_cmd_control

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 heyunlei@huawei.com Signed-off-by: Jaegeuk Kim jaegeuk@kernel.org [bwh: Backported to 4.9: adjust context]

---

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

Now queued up, thanks.

greg k-h