This is a note to let you know that I've just added the patch titled tmpfs: don't undo fallocate past its last page to the 3.14-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: tmpfs-don-t-undo-fallocate-past-its-last-page.patch and it can be found in the queue-3.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From b9b4bb26af017dbe930cd4df7f9b2fc3a0497bfe Mon Sep 17 00:00:00 2001 From: Anthony Romano <anthony.romano@xxxxxxxxxx> Date: Fri, 24 Jun 2016 14:48:43 -0700 Subject: tmpfs: don't undo fallocate past its last page From: Anthony Romano <anthony.romano@xxxxxxxxxx> commit b9b4bb26af017dbe930cd4df7f9b2fc3a0497bfe upstream. When fallocate is interrupted it will undo a range that extends one byte past its range of allocated pages. This can corrupt an in-use page by zeroing out its first byte. Instead, undo using the inclusive byte range. Fixes: 1635f6a74152f1d ("tmpfs: undo fallocation on failure") Link: http://lkml.kernel.org/r/1462713387-16724-1-git-send-email-anthony.romano@xxxxxxxxxx Signed-off-by: Anthony Romano <anthony.romano@xxxxxxxxxx> Cc: Vlastimil Babka <vbabka@xxxxxxx> Cc: Hugh Dickins <hughd@xxxxxxxxxx> Cc: Brandon Philips <brandon@xxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- mm/shmem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/shmem.c +++ b/mm/shmem.c @@ -1895,7 +1895,7 @@ static long shmem_fallocate(struct file /* Remove the !PageUptodate pages we added */ shmem_undo_range(inode, (loff_t)start << PAGE_CACHE_SHIFT, - (loff_t)index << PAGE_CACHE_SHIFT, true); + ((loff_t)index << PAGE_CACHE_SHIFT) - 1, true); goto undone; } Patches currently in stable-queue which might be from anthony.romano@xxxxxxxxxx are queue-3.14/tmpfs-don-t-undo-fallocate-past-its-last-page.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