From 4fa99b008fb53ade9bacea51d29b24efee8914a8 Mon Sep 17 00:00:00 2001 From: Filipe Manana Date: Fri, 14 Dec 2018 19:45:13 +0000 Subject: [PATCH] Btrfs: do not overwrite error return value in scrub progress ioctl If the call to btrfs_scrub_progress() failed we would overwrite the error returned to user space with -EFAULT if the call to copy_to_user() failed as well. Fix that by calling copy_to_user() only if btrfs_scrub_progress() returned success. Reviewed-by: Nikolay Borisov Reviewed-by: Johannes Thumshirn Reviewed-by: Anand Jain Signed-off-by: Filipe Manana Signed-off-by: David Sterba --- fs/btrfs/ioctl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index d34e54d80149..02ea03d220e8 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -4414,7 +4414,7 @@ static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info, ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress); - if (copy_to_user(arg, sa, sizeof(*sa))) + if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa))) ret = -EFAULT; kfree(sa);