From 3b889a787863d22694bb53eb08160c94ab52c58d Mon Sep 17 00:00:00 2001
From: Andrew Burgess <andrew.burgess@embecosm.com>
Date: Tue, 3 May 2016 13:43:44 +0100
Subject: [PATCH] gas/arc: Add guard against operand array overflow.

Currently supplying an input file with too many operands to an
instruction will cause the assembler to overflow and array and trigger
undefined behaviour.

This change checks that we don't access outside the limits of the
operand array.

gas/ChangeLog:

	* config/tc-arc.c (tokenize_arguments): Add checks for array
	overflow.
	* testsuite/gas/arc/asm-errors.s: Addition test line added.
	* testsuite/gas/arc/asm-errors.err: Update expected results.
---
 gas/ChangeLog                        |  7 +++++++
 gas/config/tc-arc.c                  | 12 +++++++-----
 gas/testsuite/gas/arc/asm-errors.err |  2 ++
 gas/testsuite/gas/arc/asm-errors.s   |  1 +
 4 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/gas/ChangeLog b/gas/ChangeLog
index aa507703ff..bd529cd895 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,10 @@
+2016-05-18  Andrew Burgess  <andrew.burgess@embecosm.com>
+
+	* config/tc-arc.c (tokenize_arguments): Add checks for array
+	overflow.
+	* testsuite/gas/arc/asm-errors.s: Addition test line added.
+	* testsuite/gas/arc/asm-errors.err: Update expected results.
+
 2016-05-18  Trevor Saunders  <tbsaunde+binutils@tbsaunde.org>
 
 	* config/tc-rx.c (struct cpu_type): Change the type of a field from
diff --git a/gas/config/tc-arc.c b/gas/config/tc-arc.c
index 28f135b2c7..ca94b1f6d9 100644
--- a/gas/config/tc-arc.c
+++ b/gas/config/tc-arc.c
@@ -1039,7 +1039,7 @@ tokenize_arguments (char *str,
 	case ']':
 	  ++input_line_pointer;
 	  --brk_lvl;
-	  if (!saw_arg)
+	  if (!saw_arg || num_args == ntok)
 	    goto err;
 	  tok->X_op = O_bracket;
 	  ++tok;
@@ -1049,7 +1049,7 @@ tokenize_arguments (char *str,
 	case '{':
 	case '[':
 	  input_line_pointer++;
-	  if (brk_lvl)
+	  if (brk_lvl || num_args == ntok)
 	    goto err;
 	  ++brk_lvl;
 	  tok->X_op = O_bracket;
@@ -1060,7 +1060,7 @@ tokenize_arguments (char *str,
 	case '@':
 	  /* We have labels, function names and relocations, all
 	     starting with @ symbol.  Sort them out.  */
-	  if (saw_arg && !saw_comma)
+	  if ((saw_arg && !saw_comma) || num_args == ntok)
 	    goto err;
 
 	  /* Parse @label.  */
@@ -1165,7 +1165,7 @@ tokenize_arguments (char *str,
 	  /* Fall through.  */
 	default:
 
-	  if (saw_arg && !saw_comma)
+	  if ((saw_arg && !saw_comma) || num_args == ntok)
 	    goto err;
 
 	  tok->X_op = O_absent;
@@ -1181,7 +1181,9 @@ tokenize_arguments (char *str,
 	normalsymbol:
 	  debug_exp (tok);
 
-	  if (tok->X_op == O_illegal || tok->X_op == O_absent)
+	  if (tok->X_op == O_illegal
+              || tok->X_op == O_absent
+              || num_args == ntok)
 	    goto err;
 
 	  saw_comma = FALSE;
diff --git a/gas/testsuite/gas/arc/asm-errors.err b/gas/testsuite/gas/arc/asm-errors.err
index 35390fc3e8..e889eb8e0e 100644
--- a/gas/testsuite/gas/arc/asm-errors.err
+++ b/gas/testsuite/gas/arc/asm-errors.err
@@ -2,3 +2,5 @@
 [^:]*:2: Error: inappropriate arguments for opcode 'adc'
 [^:]*:3: Error: inappropriate arguments for opcode 'adc'
 [^:]*:4: Error: inappropriate arguments for opcode 'adc'
+[^:]*:5: Error: extra comma
+[^:]*:5: Error: syntax error
diff --git a/gas/testsuite/gas/arc/asm-errors.s b/gas/testsuite/gas/arc/asm-errors.s
index 6e0fd6ae1a..d3f16c07f4 100644
--- a/gas/testsuite/gas/arc/asm-errors.s
+++ b/gas/testsuite/gas/arc/asm-errors.s
@@ -2,3 +2,4 @@
         adc.al.ra       r0,r0,r2
         adc.eq.eq       r0,r0,r2
         adc.n.eq        r0,r0,r2
+        add             r0,r0,r0,r0,r0,r0,r0,r0,r0,r0,r0,r0,r0,r0,r0,r0,r0,r0,r0,r0,r0,r0,r0,r0,r0,r0,r0,r0,r0,r0
-- 
2.34.1