Sanity check read_section_stabs_debugging_info

Sanity check read_section_stabs_debugging_info

[Alan Modra]

	* rddbg.c (read_section_stabs_debugging_info): Exclude sections
	without contents.  Use bfd_malloc_and_get_section.  Don't alloc
	one extra for strings.

diff --git a/binutils/rddbg.c b/binutils/rddbg.c
index 036a74fc16a..f2ed6bcb3dd 100644
--- a/binutils/rddbg.c
+++ b/binutils/rddbg.c
@@ -117,39 +117,37 @@ read_section_stabs_debugging_info (bfd *abfd, asymbol **syms, long symcount,
 
       sec = bfd_get_section_by_name (abfd, names[i].secname);
       strsec = bfd_get_section_by_name (abfd, names[i].strsecname);
-      if (sec != NULL && strsec != NULL)
+      if (sec != NULL
+	  && (bfd_section_flags (sec) & SEC_HAS_CONTENTS) != 0
+	  && strsec != NULL
+	  && (bfd_section_flags (strsec) & SEC_HAS_CONTENTS) != 0)
 	{
 	  bfd_size_type stabsize, strsize;
 	  bfd_byte *stabs, *strings;
 	  bfd_byte *stab;
 	  bfd_size_type stroff, next_stroff;
 
-	  stabsize = bfd_section_size (sec);
-	  stabs = (bfd_byte *) xmalloc (stabsize);
-	  if (! bfd_get_section_contents (abfd, sec, stabs, 0, stabsize))
+	  if (!bfd_malloc_and_get_section (abfd, sec, &stabs))
 	    {
 	      fprintf (stderr, "%s: %s: %s\n",
 		       bfd_get_filename (abfd), names[i].secname,
 		       bfd_errmsg (bfd_get_error ()));
 	      free (shandle);
-	      free (stabs);
 	      return false;
 	    }
 
-	  strsize = bfd_section_size (strsec);
-	  strings = (bfd_byte *) xmalloc (strsize + 1);
-	  if (! bfd_get_section_contents (abfd, strsec, strings, 0, strsize))
+	  if (!bfd_malloc_and_get_section (abfd, strsec, &strings))
 	    {
 	      fprintf (stderr, "%s: %s: %s\n",
 		       bfd_get_filename (abfd), names[i].strsecname,
 		       bfd_errmsg (bfd_get_error ()));
 	      free (shandle);
-	      free (strings);
 	      free (stabs);
 	      return false;
 	    }
 	  /* Zero terminate the strings table, just in case.  */
-	  strings [strsize] = 0;
+	  strsize = bfd_section_size (strsec);
+	  strings [strsize - 1] = 0;
 	  if (shandle == NULL)
 	    {
 	      shandle = start_stab (dhandle, abfd, true, syms, symcount);
@@ -165,6 +163,7 @@ read_section_stabs_debugging_info (bfd *abfd, asymbol **syms, long symcount,
 
 	  stroff = 0;
 	  next_stroff = 0;
+	  stabsize = bfd_section_size (sec);
 	  /* PR 17512: file: 078-60391-0.001:0.1.  */
 	  for (stab = stabs; stab <= (stabs + stabsize) - 12; stab += 12)
 	    {

-- 
Alan Modra
Australia Development Lab, IBM

Re: Sanity check read_section_stabs_debugging_info

[Alan Modra]

	* rddbg.c (read_section_stabs_debugging_info): Don't segfault on
	zero size string section.

diff --git a/binutils/rddbg.c b/binutils/rddbg.c
index f2ed6bcb3dd..1a888778312 100644
--- a/binutils/rddbg.c
+++ b/binutils/rddbg.c
@@ -147,7 +147,8 @@ read_section_stabs_debugging_info (bfd *abfd, asymbol **syms, long symcount,
 	    }
 	  /* Zero terminate the strings table, just in case.  */
 	  strsize = bfd_section_size (strsec);
-	  strings [strsize - 1] = 0;
+	  if (strsize != 0)
+	    strings [strsize - 1] = 0;
 	  if (shandle == NULL)
 	    {
 	      shandle = start_stab (dhandle, abfd, true, syms, symcount);

-- 
Alan Modra
Australia Development Lab, IBM