Fix potential array overrun in x86 assembler.

	* config/tc-i386.c (parse_operands): Check for operand overflow
	before setting the unspecified bit.

diff --git a/gas/ChangeLog b/gas/ChangeLog
index d515f3b..fbadd0b 100644 (file)
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,8 @@
+2017-01-20  Nick Clifton  <nickc@redhat.com>
+
+       * config/tc-i386.c (parse_operands): Check for operand overflow
+       before setting the unspecified bit.
+
 2017-01-18  Maciej W. Rozycki  <macro@imgtec.com>
 
        PR gas/20649

diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c
index 80812cf..1fc6bc7 100644 (file)
--- a/gas/config/tc-i386.c
+++ b/gas/config/tc-i386.c
@@ -4136,13 +4136,13 @@ parse_operands (char *l, const char *mnemonic)
        {                       /* Yes, we've read in another operand.  */
          unsigned int operand_ok;
          this_operand = i.operands++;
-         i.types[this_operand].bitfield.unspecified = 1;
          if (i.operands > MAX_OPERANDS)
            {
              as_bad (_("spurious operands; (%d operands/instruction max)"),
                      MAX_OPERANDS);
              return NULL;
            }
+         i.types[this_operand].bitfield.unspecified = 1;
          /* Now parse operand adding info to 'i' as we go along.  */
          END_STRING_AND_SAVE (l);