[patch] cifs: writing past end of struct in cifs_convert_address()

[Jeff Layton]

On Thu, 1 Mar 2012 10:06:52 +0300
Dan Carpenter <dan.carpenter at oracle.com> wrote:

> "s6->sin6_scope_id" is an int bits but strict_strtoul() writes a long
> so this can corrupt memory on 64 bit systems.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>
> 
> diff --git a/fs/cifs/netmisc.c b/fs/cifs/netmisc.c
> index 73e47e8..cab99b5 100644
> --- a/fs/cifs/netmisc.c
> +++ b/fs/cifs/netmisc.c
> @@ -197,8 +197,7 @@ cifs_convert_address(struct sockaddr *dst, const char *src, int len)
>  		memcpy(scope_id, pct + 1, slen);
>  		scope_id[slen] = '\0';
>  
> -		rc = strict_strtoul(scope_id, 0,
> -					(unsigned long *)&s6->sin6_scope_id);
> +		rc = kstrtouint(scope_id, 0, &s6->sin6_scope_id);
>  		rc = (rc == 0) ? 1 : 0;
>  	}
>  

Reviewed-by: Jeff Layton <jlayton at redhat.com>