From: David van Moolenbroek <david@minix3.org>
Date: Thu, 24 Dec 2009 23:43:16 +0000 (+0000)
Subject: Fix MFS ftruncate crash (Bug#370, reported by Aki Goto)
X-Git-Tag: v3.1.6~131
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/index.html?a=commitdiff_plain;h=c8f8d6920414f422e0c31080c09d0f7b8101bbac;p=minix.git

Fix MFS ftruncate crash (Bug#370, reported by Aki Goto)
---

diff --git a/servers/mfs/write.c b/servers/mfs/write.c
index 797a6e45d..3bac78cb9 100644
--- a/servers/mfs/write.c
+++ b/servers/mfs/write.c
@@ -166,10 +166,10 @@ int op;				/* special actions */
   }
 
   /* If the single indirect block isn't there (or was just freed),
-   * see if we have to keep the double indirect block.
+   * see if we have to keep the double indirect block, if any.
    */
-  if(z1 == NO_ZONE && !single && empty_indir(bp_dindir, rip->i_sp) &&
-     z2 != NO_ZONE) {
+  if(z1 == NO_ZONE && !single && z2 != NO_ZONE &&
+     empty_indir(bp_dindir, rip->i_sp)) {
 	free_zone(rip->i_dev, z2);
 	rip->i_zone[zones+1] = NO_ZONE;
   }