fix segfault with corrupted metadata in code_ns_fraction(#531441)

tar-1.22-nsfraction.patch

@@ -1,12 +1,25 @@
 diff -urNp tar-1.22-orig/src/misc.c tar-1.22/src/misc.c
 --- tar-1.22-orig/src/misc.c	2007-06-27 15:30:32.000000000 +0200
-+++ tar-1.22/src/misc.c	2009-12-08 13:41:46.000000000 +0100
-@@ -228,7 +228,7 @@ code_ns_fraction (int ns, char *p)
-     *p = '\0';
-   else
-     {
--      int i = 9;
-+      int i = 10;
-       *p++ = '.';
++++ tar-1.22/src/misc.c	2010-02-04 12:05:00.000000000 +0100
+@@ -255,7 +255,20 @@ code_timespec (struct timespec t, char s
+   time_t s = t.tv_sec;
+   int ns = t.tv_nsec;
+   char *np;
+-  bool negative = s < 0;
++  bool negative;
++
++  /* ignore any negative ns value */
++  if (ns < 0)
++    ns = 0;
++
++  /* ensure (ns < BILLION) to avoid SIGSEGV within code_ns_fraction () */
++  if (BILLION <= ns )
++    {
++      s += ns / BILLION;
++      ns %= BILLION;
++    }
++
++  negative = s < 0;
  
-       while (ns % 10 == 0)
+   if (negative && ns != 0)
+     {

tar.spec

@@ -5,7 +5,7 @@ Summary: A GNU file archiving program
 Name: tar
 Epoch: 2
 Version: 1.22
-Release: 14%{?dist}
+Release: 15%{?dist}
 License: GPLv3+
 Group: Applications/Archiving
 URL: http://www.gnu.org/software/tar/
@@ -69,7 +69,7 @@ the rmt package.
 %patch6 -p1 -b .shortread
 %patch7 -p1 -b .headerblackmagic
 %patch8 -p1 -b .xheaderleak
-#%patch9 -p1 -b .nsfraction #causing stack smashing, do not apply
+%patch9 -p1 -b .nsfraction
 %patch10 -p1 -b .utimens
 
 autoreconf
@@ -132,6 +132,10 @@ fi
 %{_infodir}/tar.info*
 
 %changelog
+* Thu Feb 04 2010 Ondrej Vasik <ovasik@redhat.com> 2:1.22-15
+- fix segfault with corrupted metadata in code_ns_fraction
+  (#531441)
+
 * Wed Feb 03 2010 Kamil Dudka <kdudka@redhat.com> 2:1.22-14
 - allow also build with SELinux support