Fix illegal memory access triggered when attempting to assemble a bogus i386 source...

	PR 24538
	* config/tc-i386-intel.c (i386_intel_simplify_register): Reject
	illegal register numbers.

diff --git a/gas/ChangeLog b/gas/ChangeLog
index 57be175..1530ebf 100644 (file)
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,9 @@
+2019-05-14  Nick Clifton  <nickc@redhat.com>
+
+       PR 24538
+       * config/tc-i386-intel.c (i386_intel_simplify_register): Reject
+       illegal register numbers.
+
 2019-05-10  Nick Clifton  <nickc@redhat.com>
 
        PR 24538

diff --git a/gas/config/tc-i386-intel.c b/gas/config/tc-i386-intel.c
index a12886d..a2cd286 100644 (file)
--- a/gas/config/tc-i386-intel.c
+++ b/gas/config/tc-i386-intel.c
@@ -270,6 +270,12 @@ i386_intel_simplify_register (expressionS *e)
   else
     reg_num = e->X_md - 1;
 
+  if (reg_num < 0 || reg_num >= (int) i386_regtab_size)
+    {
+      as_bad (_("invalid register number"));
+      return 0;
+    }
+
   if (!intel_state.in_bracket)
     {
       if (i.op[this_operand].regs)