Fix allocation when handling positional parameters in printf.

ChangeLog

@@ -1,3 +1,11 @@
+2011-01-27  Petr Baudis  <pasky@suse.cz>
+	    Ulrich Drepper  <drepper@gmail.com>
+
+	* stdio-common/vfprintf.c (vfprintf): Pass correct newlen
+	to extend_alloca().
+	* stdio-common/bug23.c: New file.
+	* stdio-common/Makefile (tests): Add bug23.
+
 2010-09-28  Andreas Schwab  <schwab@redhat.com>
 	    Ulrich Drepper  <drepper@gmail.com>
 

stdio-common/Makefile

@@ -60,7 +60,7 @@ tests := tstscanf test_rdwr test-popen tstgetln test-fseek \
 	 tst-popen tst-unlockedio tst-fmemopen2 tst-put-error tst-fgets \
 	 tst-fwrite bug16 bug17 tst-swscanf tst-sprintf2 bug18 bug18a \
 	 bug19 bug19a tst-popen2 scanf13 scanf14 scanf15 bug20 bug21 bug22 \
-	 scanf16 scanf17 tst-setvbuf1 tst-grouping
+	 scanf16 scanf17 tst-setvbuf1 tst-grouping bug23
 
 test-srcs = tst-unbputc tst-printf
 

stdio-common/bug23.c

@@ -0,0 +1,21 @@
+#include <stdio.h>
+#include <string.h>
+
+static char buf[32768];
+static const char expected[] = "\
+\n\
+a\n\
+abbcd55%%%%%%%%%%%%%%%%%%%%%%%%%%\n";
+
+static int
+do_test (void)
+{
+  snprintf (buf, sizeof (buf),
+	    "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d"
+	    "%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%\n",
+	    "a", "b", "c", "d", 5);
+  return strcmp (buf, expected) != 0;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"

stdio-common/vfprintf.c

@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2008, 2009, 2010   Free Software Foundation, Inc.
+/* Copyright (C) 1991-2008, 2009, 2010, 2011   Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -1682,7 +1682,8 @@ do_positional:
 	  {
 	    /* Extend the array of format specifiers.  */
 	    struct printf_spec *old = specs;
-	    specs = extend_alloca (specs, nspecs_max, 2 * nspecs_max);
+	    specs = extend_alloca (specs, nspecs_max,
+				   2 * nspecs_max * sizeof (*specs));
 
 	    /* Copy the old array's elements to the new space.  */
 	    memmove (specs, old, nspecs * sizeof (struct printf_spec));