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[PATCH] lib/vsprintf.c: increase the size of the field_width variable

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When printing a bitmap using the "%*pb[l]" printk format
a 16 bit variable (field_width) is used to store the size of the bitmap.
In some cases 16 bits are not sufficient, the variable overflows and
printk does not work as expected.

This patch fixes the problem by changing the type of field_width to s32.

How to reproduce the bug:

1.load scsi_debug
# modprobe scsi-debug dev_size_mb=256 lbpu=1 lbpws10=1

2.create VG
# vgcreate tsvg /dev/sdb
  Physical volume "/dev/sdb" successfully created
  Volume group "tsvg" successfully created

3. Bitmap should be set, but still empty
# cat /sys/bus/pseudo/drivers/scsi_debug/map

Expected results:
# cat /sys/bus/pseudo/drivers/scsi_debug/map
0-15

Signed-off-by: Maurizio Lombardi <mlombard@redhat.com>
---
 lib/vsprintf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 95cd63b..20f91c4 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -384,8 +384,8 @@ struct printf_spec {
 	u8	flags;		/* flags to number() */
 	u8	base;		/* number base, 8, 10 or 16 only */
 	u8	qualifier;	/* number qualifier, one of 'hHlLtzZ' */
-	s16	field_width;	/* width of output field */
 	s16	precision;	/* # of digits/chars */
+	s32	field_width;	/* width of output field */
 };
 
 static noinline_for_stack
-- 
Maurizio Lombardi

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[PATCH] lib/vsprintf.c: increase the size of the field_width variable Maurizio Lombardi <mlombard@redhat.com> - 2015-09-09 12:20 +0200
  Re: [PATCH] lib/vsprintf.c: increase the size of the field_width  variable Tejun Heo <tj@kernel.org> - 2015-09-09 15:40 +0200
  Re: [PATCH] lib/vsprintf.c: increase the size of the field_width  variable Joe Perches <joe@perches.com> - 2015-09-09 18:40 +0200
    Re: [PATCH] lib/vsprintf.c: increase the size of the field_width  variable Tejun Heo <tj@kernel.org> - 2015-09-09 18:40 +0200
      Re: [PATCH] lib/vsprintf.c: increase the size of the field_width  variable Joe Perches <joe@perches.com> - 2015-09-09 19:00 +0200
    Re: [PATCH] lib/vsprintf.c: increase the size of the field_width variable Rasmus Villemoes <linux@rasmusvillemoes.dk> - 2015-09-09 21:00 +0200
      Re: [PATCH] lib/vsprintf.c: increase the size of the field_width  variable Joe Perches <joe@perches.com> - 2015-09-09 21:30 +0200
        Re: [PATCH] lib/vsprintf.c: increase the size of the field_width  variable Tejun Heo <tj@kernel.org> - 2015-09-10 16:40 +0200
          Re: [PATCH] lib/vsprintf.c: increase the size of the field_width  variable Joe Perches <joe@perches.com> - 2015-09-10 17:50 +0200
            Re: [PATCH] lib/vsprintf.c: increase the size of the field_width  variable Tejun Heo <tj@kernel.org> - 2015-09-10 17:50 +0200
      Re: [PATCH] lib/vsprintf.c: increase the size of the field_width  variable Maurizio Lombardi <mlombard@redhat.com> - 2015-09-10 09:10 +0200
        Re: [PATCH] lib/vsprintf.c: increase the size of the field_width  variable Maurizio Lombardi <mlombard@redhat.com> - 2015-09-10 09:20 +0200
        Re: [PATCH] lib/vsprintf.c: increase the size of the field_width  variable Joe Perches <joe@perches.com> - 2015-09-10 09:40 +0200
          Re: [PATCH] lib/vsprintf.c: increase the size of the field_width variable Rasmus Villemoes <linux@rasmusvillemoes.dk> - 2015-09-10 10:00 +0200
            Re: [PATCH] lib/vsprintf.c: increase the size of the field_width  variable Joe Perches <joe@perches.com> - 2015-09-10 10:20 +0200
              Re: [PATCH] lib/vsprintf.c: increase the size of the field_width  variable Tejun Heo <tj@kernel.org> - 2015-09-10 16:50 +0200
          Re: [PATCH] lib/vsprintf.c: increase the size of the field_width  variable Maurizio Lombardi <mlombard@redhat.com> - 2015-09-10 10:40 +0200

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