Make sure that sensible values are extracted from a raw header.

diff --git a/gprof/ChangeLog b/gprof/ChangeLog
index 2f490fb..ae5e9f4 100644 (file)
--- a/gprof/ChangeLog
+++ b/gprof/ChangeLog
@@ -1,3 +1,8 @@
+1999-09-24  Nick Clifton  <nickc@cygnus.com>
+
+       * gmon_io.c (gmon_out_read): Make sure that sensible values
+       are extracted from a raw header.
+
 1999-08-06  Ian Lance Taylor  <ian@zembu.com>
 
        From Brad Lucier <lucier@math.purdue.edu>:

diff --git a/gprof/gmon_io.c b/gprof/gmon_io.c
index 067323c..7e0a1a0 100644 (file)
--- a/gprof/gmon_io.c
+++ b/gprof/gmon_io.c
@@ -251,6 +251,15 @@ DEFUN (gmon_out_read, (filename), const char *filename)
           printf ("[gmon_out_read] samp_bytes %d hist_num_bins %d\n",
                   samp_bytes, hist_num_bins));
 
+      /* Make sure that we have sensible values.  */
+      if (samp_bytes < 0 || lowpc > highpc)
+        {
+          fprintf (stderr, 
+           _("%s: file '%s' does not appear to be in gmon.out format\n"),
+           whoami, filename);
+          done (1);
+        }
+
       if (hist_num_bins)
        {
          ++nhist;