mkfs-b: Check that blocksize parameter is > 0 and a power of 2.

[libguestfs.git] / daemon / mkfs.c

diff --git a/daemon/mkfs.c b/daemon/mkfs.c
index 6735d24..2c3a3cd 100644 (file)
--- a/daemon/mkfs.c
+++ b/daemon/mkfs.c
@@ -104,6 +104,11 @@ do_mkfs_b (const char *fstype, int blocksize, const char *device)
   const char *extra[2];
   char blocksize_s[32];
 
+  if (blocksize <= 0 || !is_power_of_2 (blocksize)) {
+    reply_with_error ("block size must be > 0 and a power of 2");
+    return -1;
+  }
+
   snprintf (blocksize_s, sizeof blocksize_s, "%d", blocksize);
 
   extra[0] = "-b";