From a67d66eb97e7613a38ffe6622d837303b3ecd31d Mon Sep 17 00:00:00 2001
From: Nick Clifton <nickc@redhat.com>
Date: Wed, 1 Nov 2017 15:21:46 +0000
Subject: [PATCH] Prevent illegal memory accesses when attempting to read
 excessively large COFF line number tables.

	PR 22376
	* coffcode.h (coff_slurp_line_table): Check for an excessively
	large line number count.
diff --git a/bfd/coffcode.h b/bfd/coffcode.h
index 21308de..6da0afa 100644
--- a/bfd/coffcode.h
+++ b/bfd/coffcode.h
@@ -4578,6 +4578,14 @@ coff_slurp_line_table (bfd *abfd, asection *asect)
 
   BFD_ASSERT (asect->lineno == NULL);
 
+  if (asect->lineno_count > asect->size)
+    {
+      _bfd_error_handler
+	(_("%B: warning: line number count (%#lx) exceeds section size (%#lx)"),
+	 abfd, (unsigned long) asect->lineno_count, (unsigned long) asect->size);
+      return FALSE;
+    }
+
   amt = ((bfd_size_type) asect->lineno_count + 1) * sizeof (alent);
   lineno_cache = (alent *) bfd_alloc (abfd, amt);
   if (lineno_cache == NULL)
-- 
2.9.3