X-Git-Url: http://git.annexia.org/?p=libguestfs.git;a=blobdiff_plain;f=daemon%2Fmkfs.c;h=2c3a3cd9e4f6279aa7cdd51babf426de03bef00e;hp=6735d24dca3b73e541eb47d2b575d0adf66b05e4;hb=0606cb54671e10f104b4eba1c70378ef8725322b;hpb=9e0b31a2af26b8d58a44dd80993a5e73d4942307

diff --git a/daemon/mkfs.c b/daemon/mkfs.c
index 6735d24..2c3a3cd 100644
--- 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";