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Commit a27202fb authored by Jim Meyering's avatar Jim Meyering Committed by Josef Bacik
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Btrfs: NUL-terminate path buffer in DEV_INFO ioctl result 



A device with name of length BTRFS_DEVICE_PATH_NAME_MAX or longer
would not be NUL-terminated in the DEV_INFO ioctl result buffer.

Signed-off-by: default avatarJim Meyering <meyering@redhat.com>
parent f07c9a79

fs/btrfs/ioctl.c

+4 −2
Original line number Diff line number Diff line
@@ -2263,10 +2263,12 @@ static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) 
	di_args->bytes_used = dev->bytes_used;

	di_args->total_bytes = dev->total_bytes;

	memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));

	if (dev->name)

	if (dev->name) {

		strncpy(di_args->path, dev->name, sizeof(di_args->path));

	else

		di_args->path[sizeof(di_args->path) - 1] = 0;

	} else {

		di_args->path[0] = '\0';

	}



out:

	if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))