btrfs-progs: properly set up ioctl arguments

At some places we do not clear the whole ioctl structure and could
pass garbage to kernel. Zero the ioctl vol_args and use a helper for
copying the path.

Signed-off-by: David Sterba <dsterba@suse.cz>

1 files changed, 1 insertions, 0 deletions

diff --git a/cmds-filesystem.c b/cmds-filesystem.c
index ccf89c6..dcd3f47 100644
--- a/cmds-filesystem.c
+++ b/cmds-filesystem.c
@@ -1270,6 +1270,7 @@ static int cmd_resize(int argc, char **argv)
 	}
 
 	printf("Resize '%s' of '%s'\n", path, amount);
+	memset(&args, 0, sizeof(args));
 	strncpy_null(args.name, amount);
 	res = ioctl(fd, BTRFS_IOC_RESIZE, &args);
 	e = errno;