Fix fault in assembler when passed a bogus input file.

	PR gas/20902
	* read.c (next_char_of_string): Do end advance past the end of the
	buffer.

1 files changed, 12 insertions, 0 deletions

diff --git a/gas/read.c b/gas/read.c
index 2f756db..0cc0d20 100644
--- a/gas/read.c
+++ b/gas/read.c
@@ -5533,6 +5533,12 @@ next_char_of_string (void)
   c = *input_line_pointer++ & CHAR_MASK;
   switch (c)
     {
+    case 0:
+      /* PR 20902: Do not advance past the end of the buffer.  */
+      -- input_line_pointer;
+      c = NOT_A_CHAR;
+      break;
+
     case '\"':
       c = NOT_A_CHAR;
       break;
@@ -5629,6 +5635,12 @@ next_char_of_string (void)
 	  bump_line_counters ();
 	  break;
 
+	case 0:
+	  /* Do not advance past the end of the buffer.  */
+	  -- input_line_pointer;
+	  c = NOT_A_CHAR;
+	  break;
+
 	default:
 
 #ifdef ONLY_STANDARD_ESCAPES