This is a note to let you know that I've just added the patch titled f2fs: fix possible data corruption in f2fs_write_begin() to the 3.17-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: f2fs-fix-possible-data-corruption-in-f2fs_write_begin.patch and it can be found in the queue-3.17 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 9234f3190bf8b25b11b105191d408ac50a107948 Mon Sep 17 00:00:00 2001 From: Jan Kara <jack@xxxxxxx> Date: Wed, 22 Oct 2014 15:21:47 +0200 Subject: f2fs: fix possible data corruption in f2fs_write_begin() From: Jan Kara <jack@xxxxxxx> commit 9234f3190bf8b25b11b105191d408ac50a107948 upstream. f2fs_write_begin() doesn't initialize the 'dn' variable if the inode has inline data. However it uses its contents to decide whether it should just zero out the page or load data to it. Thus if we are unlucky we can zero out page contents instead of loading inline data into a page. CC: Changman Lee <cm224.lee@xxxxxxxxxxx> Signed-off-by: Jan Kara <jack@xxxxxxx> Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/f2fs/data.c | 24 +++++++++++------------- 1 file changed, 11 insertions(+), 13 deletions(-) --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -1002,21 +1002,19 @@ inline_data: goto out; } - if (dn.data_blkaddr == NEW_ADDR) { + if (f2fs_has_inline_data(inode)) { + err = f2fs_read_inline_data(inode, page); + if (err) { + page_cache_release(page); + goto fail; + } + } else if (dn.data_blkaddr == NEW_ADDR) { zero_user_segment(page, 0, PAGE_CACHE_SIZE); } else { - if (f2fs_has_inline_data(inode)) { - err = f2fs_read_inline_data(inode, page); - if (err) { - page_cache_release(page); - goto fail; - } - } else { - err = f2fs_submit_page_bio(sbi, page, dn.data_blkaddr, - READ_SYNC); - if (err) - goto fail; - } + err = f2fs_submit_page_bio(sbi, page, dn.data_blkaddr, + READ_SYNC); + if (err) + goto fail; lock_page(page); if (unlikely(!PageUptodate(page))) { Patches currently in stable-queue which might be from jack@xxxxxxx are queue-3.17/isofs-fix-infinite-looping-over-ce-entries.patch queue-3.17/f2fs-fix-possible-data-corruption-in-f2fs_write_begin.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html