Xen devel - Jan 2007 - [PATCH] Fix parse_size_and_unit() breakage in xen-3.0.4-testing (kdump broken)

Fix parse_size_and_unit() breakage in xen-3.0.4-testing (kdump broken)

Kdump has been broken since xen-3.0.4-testing.hg-13109.
Many thanks to Hiromichi Itou for tracking this down.

Signed-Off-By: Magnus Damm <magnus@valinux.co.jp>

---

Applies to xen-3.0.4-testing-13130.

--- 0001/xen/common/lib.c
+++ work/xen/common/lib.c	2007-01-10 11:18:38.000000000 +0900
@@ -442,7 +442,7 @@ s64 __moddi3(s64 a, s64 b)
 unsigned long long parse_size_and_unit(const char *s, const char **ps)
 {
 	unsigned long long ret;
-	const char *s1;
+	const char *s1 = NULL;
 
 	ret = simple_strtoull(s, &s1, 0);
 
@@ -454,7 +454,7 @@ unsigned long long parse_size_and_unit(c
 	case ''K'': case ''k'':
 		ret <<= 10;
 	case ''B'': case ''b'':
-		s++;
+		s1++;
 		break;
 	default:
 		ret <<= 10; /* default to kB */

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On Wed, 2007-01-10 at 17:42 +0900, Magnus Damm wrote:
> Fix parse_size_and_unit() breakage in xen-3.0.4-testing (kdump broken)
> 
> Kdump has been broken since xen-3.0.4-testing.hg-13109.
> Many thanks to Hiromichi Itou for tracking this down.
> 
> Signed-Off-By: Magnus Damm <magnus@valinux.co.jp>
I applied a similar fix to xen-unstable.hg in 13282:9865145e53eb. I''ll
get it pulled into xen-3.0.4-testing.hg.
> --- 0001/xen/common/lib.c
> +++ work/xen/common/lib.c	2007-01-10 11:18:38.000000000 +0900
> @@ -442,7 +442,7 @@ s64 __moddi3(s64 a, s64 b)
>  unsigned long long parse_size_and_unit(const char *s, const char **ps)
>  {
>  	unsigned long long ret;
> -	const char *s1;
> +	const char *s1 = NULL;
>  
>  	ret = simple_strtoull(s, &s1, 0);
Are you sure this bit is necessary? simple_strtoull always initialises
&s1.

Ian.


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>Fix parse_size_and_unit() breakage in xen-3.0.4-testing (kdump broken)
>
>Kdump has been broken since xen-3.0.4-testing.hg-13109.
>Many thanks to Hiromichi Itou for tracking this down.
>
>Signed-Off-By: Magnus Damm <magnus@valinux.co.jp>
>
>---
>
>Applies to xen-3.0.4-testing-13130.
Applied (second hunk only to minimize diff w/ -unstable). 

thanks, 


S.


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On 1/10/07, Ian Campbell <Ian.Campbell@xensource.com>
wrote:
> On Wed, 2007-01-10 at 17:42 +0900, Magnus Damm wrote:
> > Fix parse_size_and_unit() breakage in xen-3.0.4-testing (kdump broken)
> >
> > Kdump has been broken since xen-3.0.4-testing.hg-13109.
> > Many thanks to Hiromichi Itou for tracking this down.
> >
> > Signed-Off-By: Magnus Damm <magnus@valinux.co.jp>
>
> I applied a similar fix to xen-unstable.hg in 13282:9865145e53eb.
I''ll
> get it pulled into xen-3.0.4-testing.hg.
Great, thanks.
> > --- 0001/xen/common/lib.c
> > +++ work/xen/common/lib.c     2007-01-10 11:18:38.000000000 +0900
> > @@ -442,7 +442,7 @@ s64 __moddi3(s64 a, s64 b)
> >  unsigned long long parse_size_and_unit(const char *s, const char
**ps)
> >  {
> >       unsigned long long ret;
> > -     const char *s1;
> > +     const char *s1 = NULL;
> >
> >       ret = simple_strtoull(s, &s1, 0);
>
> Are you sure this bit is necessary? simple_strtoull always initialises
> &s1.
Probably no, but the reason why I put it there is that we would be
sure to crash if someone happened to change simple_strtoull(). If
simple_strtoull() would forget to write s1 then today we may get
silent errors where switch (*s1) is used on an uninitialized variable.

/ magnus

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