Commit eee99577 authored Dec 14, 2018 by Filipe Manana Committed by David Sterba Feb 25, 2019

Btrfs: do not overwrite error return value in the get device stats ioctl



If the call to btrfs_get_dev_stats() 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_get_dev_stats()
returned success.

Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

parent 4fa99b00

fs/btrfs/ioctl.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -4438,7 +4438,7 @@ static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info,

		ret = btrfs_get_dev_stats(fs_info, sa);

		if (copy_to_user(arg, sa, sizeof(*sa)))
		if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa)))
		ret = -EFAULT;

		kfree(sa);

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