[binutils-gdb] Fix an attempt to allocate an excessive amount of memory when parsing a corrupt DWARF file.

[Nick Clifton]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=9f1c612b7c1bb2d3035ca9416e5f09d844620e89

commit 9f1c612b7c1bb2d3035ca9416e5f09d844620e89
Author: Nick Clifton <nickc@redhat.com>
Date:   Tue Apr 11 16:14:23 2023 +0100

    Fix an attempt to allocate an excessive amount of memory when parsing a corrupt DWARF file.
    
      PR 30313
      * dwarf.c (display_debug_lines_decoded): Check for an overlarge number of files or directories.

Diff:
---
 binutils/ChangeLog |  4 ++++
 binutils/dwarf.c   | 13 +++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/binutils/ChangeLog b/binutils/ChangeLog
index 285b90c2a68..59ab08a26e6 100644
--- a/binutils/ChangeLog
+++ b/binutils/ChangeLog
@@ -1,5 +1,9 @@
 2023-04-11  Nick Clifton  <nickc@redhat.com>
 
+	PR 30313
+	* dwarf.c (display_debug_lines_decoded): Check for an overlarge
+	number of files or directories.
+
 	PR 30312
 	* dwarf.c (prealloc_cu_tu_list): Always allocate at least one
 	entry.
diff --git a/binutils/dwarf.c b/binutils/dwarf.c
index ab0a3caf632..f6ff238d3cb 100644
--- a/binutils/dwarf.c
+++ b/binutils/dwarf.c
@@ -4997,6 +4997,12 @@ display_debug_lines_decoded (struct dwarf_section *  section,
 
 	      if (n_directories == 0)
 		directory_table = NULL;
+	      else if (n_directories > section->size)
+		{
+		  warn (_("number of directories (0x%x) exceeds size of section %s\n"),
+			n_directories, section->name);
+		  return 0;
+		}
 	      else
 		directory_table = (char **)
 		  xcalloc (n_directories, sizeof (unsigned char *));
@@ -5055,6 +5061,7 @@ display_debug_lines_decoded (struct dwarf_section *  section,
 	      if (do_checks && format_count > 5)
 		warn (_("Unexpectedly large number of columns in the file name table (%u)\n"),
 		      format_count);
+
 	      format_start = data;
 	      for (formati = 0; formati < format_count; formati++)
 		{
@@ -5071,6 +5078,12 @@ display_debug_lines_decoded (struct dwarf_section *  section,
 
 	      if (n_files == 0)
 		file_table = NULL;
+	      else if (n_files > section->size)
+		{
+		  warn (_("number of files (0x%x) exceeds size of section %s\n"),
+			n_files, section->name);
+		  return 0;
+		}
 	      else
 		file_table = (File_Entry *) xcalloc (n_files,
 						     sizeof (File_Entry));