linux-kernel - Re: [PATCH 3/4] include/sunrpc: remove obsolete simple

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Date:	Fri, 7 Dec 2012 08:04:18 -0500
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Abhijit Pawar <abhi.c.pawar@...il.com>
Cc:	Trond Myklebust <Trond.Myklebust@...app.com>,
	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] include/sunrpc: remove obsolete simple_strto<foo>

On Fri, Dec 07, 2012 at 05:21:36PM +0530, Abhijit Pawar wrote:
> This patch replace the obsolete simple_strto<foo> with kstrto<foo>

No, we can't apply this as is--see the recent revert of a similar
change, below.

kstrtoint does not have the same behavior as simple_strtol, so don't
blindly replace one by the other.  At a bare minimum the changelog
should have a note about the differences to help maintainers determine
if the change will cause problems.

--b.

> Signed-off-by: Abhijit Pawar <abhi.c.pawar@...il.com>
> ---
>  include/linux/sunrpc/cache.h |    6 +++---
>  1 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/sunrpc/cache.h b/include/linux/sunrpc/cache.h
> index 5dc9ee4..96d2545 100644
> --- a/include/linux/sunrpc/cache.h
> +++ b/include/linux/sunrpc/cache.h
> @@ -218,7 +218,7 @@ static inline int get_int(char **bpp, int *anint)
>  {
>  	char buf[50];
>  	char *ep;
> -	int rv;
> +	int rv, rc;
>  	int len = qword_get(bpp, buf, sizeof(buf));
>  
>  	if (len < 0)
> @@ -226,8 +226,8 @@ static inline int get_int(char **bpp, int *anint)
>  	if (len == 0)
>  		return -ENOENT;
>  
> -	rv = simple_strtol(buf, &ep, 0);
> -	if (*ep)
> +	rc = kstrtoint(buf, 0, &rv);
> +	if (rc)
>  		return -EINVAL;
>  
>  	*anint = rv;

commit 621eb19ce1ec216e03ad354cb0c4061736b2a436
Author: J. Bruce Fields <bfields@...hat.com>
Date:   Wed Nov 14 10:48:05 2012 -0500

    svcrpc: Revert "sunrpc/cache.h: replace simple_strtoul"
    
    Commit bbf43dc888833ac0539e437dbaeb28bfd4fbab9f "sunrpc/cache.h: replace
    simple_strtoul" introduced new range-checking which could cause get_int
    to fail on unsigned integers too large to be represented as an int.
    
    We could parse them as unsigned instead--but it turns out svcgssd is
    actually passing down "-1" in some cases.  Which is perhaps stupid, but
    there's nothing we can do about it now.
    
    So just revert back to the previous "sloppy" behavior that accepts
    either representation.
    
    Cc: stable@...r.kernel.org
    Reported-by: Sven Geggus <lists@...hsschwanzdomain.de>
    Signed-off-by: J. Bruce Fields <bfields@...hat.com>

diff --git a/include/linux/sunrpc/cache.h b/include/linux/sunrpc/cache.h
index f792794..5dc9ee4 100644
--- a/include/linux/sunrpc/cache.h
+++ b/include/linux/sunrpc/cache.h
@@ -217,6 +217,8 @@ extern int qword_get(char **bpp, char *dest, int bufsize);
 static inline int get_int(char **bpp, int *anint)
 {
 	char buf[50];
+	char *ep;
+	int rv;
 	int len = qword_get(bpp, buf, sizeof(buf));
 
 	if (len < 0)
@@ -224,9 +226,11 @@ static inline int get_int(char **bpp, int *anint)
 	if (len == 0)
 		return -ENOENT;
 
-	if (kstrtoint(buf, 0, anint))
+	rv = simple_strtol(buf, &ep, 0);
+	if (*ep)
 		return -EINVAL;
 
+	*anint = rv;
 	return 0;
 }
 
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