From: Julian Seward <jseward@acm.org>
Date: Fri, 24 May 2002 11:57:36 +0000 (+0000)
Subject: Avoid make_readable ( NULL, ... ) in ioctl SIOCGIFCONF.
X-Git-Tag: svn/VALGRIND_1_0_3~142
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=22028c5569174cef8f1650b719fa8a7065ccdc23;p=thirdparty%2Fvalgrind.git

Avoid make_readable ( NULL, ... ) in ioctl SIOCGIFCONF.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@324
---

diff --git a/vg_syscall_mem.c b/vg_syscall_mem.c
index bb7c84cac4..0c5d88861e 100644
--- a/vg_syscall_mem.c
+++ b/vg_syscall_mem.c
@@ -1792,7 +1792,9 @@ void VG_(perform_assumed_nonblocking_syscall) ( ThreadId tid )
                KERNEL_DO_SYSCALL(tid,res);
                if (!VG_(is_kerror)(res) && res == 0 && arg3 ) {
                   struct ifconf *ifc = (struct ifconf *) arg3;
-                  make_readable ( (Addr)(ifc->ifc_buf), (UInt)(ifc->ifc_len) );
+                  if (ifc->ifc_buf != NULL)
+                     make_readable ( (Addr)(ifc->ifc_buf), 
+                                     (UInt)(ifc->ifc_len) );
                }
                break;
             case SIOCGSTAMP: