Re: [PATCH resend #1] fix cu3088 group write

Re: [PATCH resend #1] fix cu3088 group write

[Arnd Bergmann]

Guillaume Morin wrote:

> Hi Linus, Andrew
>  
> The current cu3088 ccwgroup write code overwrite the last char of the
> given arguments. This following patch fixes the problem. It is been
> tested and applies on latest bk.

Your fix doesn't look right either. The input string should not 
be longer than BUS_ID_SIZE, including the trailing zero.
AFAICS, the correct way to solve this is the patch below,
but I did not test it. Thanks for reporting the problem.

        Arnd <><

===== drivers/s390/net/cu3088.c 1.5 vs edited =====
--- 1.5/drivers/s390/net/cu3088.c       Mon May 26 02:00:00 2003
+++ edited/drivers/s390/net/cu3088.c    Mon Aug 25 12:42:39 2003
@@ -79,7 +79,7 @@
 
                if (!(end = strchr(start, delim[i])))
                        return count;
-               len = min_t(ptrdiff_t, BUS_ID_SIZE, end - start);
+               len = min_t(ptrdiff_t, BUS_ID_SIZE, end - start + 1);
                strlcpy (bus_ids[i], start, len);
                argv[i] = bus_ids[i];
                start = end + 1;

Re: [PATCH resend #1] fix cu3088 group write

[Arnd Bergmann]

On Tuesday 26 August 2003 20:21, Guillaume Morin wrote:

> I don't know what you call "not right". My fix was the safest bet. It is
> right but yours is cleaner.

Yes, I only meant that your version wasn't the way I wanted it, not
that it was buggy like my original code.

	Arnd <><

Re: [PATCH resend #1] fix cu3088 group write

[Guillaume Morin]

Dans un message du 25 aoû à 12:47, Arnd Bergmann écrivait :
> Your fix doesn't look right either. The input string should not be
> longer than BUS_ID_SIZE, including the trailing zero.  AFAICS, the
> correct way to solve this is the patch below, but I did not test it.

Well, I did not know that BUS_ID_SIZE was including the trailing zero.
The name does not appear to suggest that. BUS_ID_LEN would have been a
better chose for that imho. 

I don't know what you call "not right". My fix was the safest bet. It is
right but yours is cleaner.

-- 
Guillaume Morin <guillaume@morinfr.org>

              Marry me girl, be my only fairy to the world (RHCP)

[PATCH resend #1] fix cu3088 group write

[Guillaume Morin]

Hi Linus, Andrew
 
The current cu3088 ccwgroup write code overwrite the last char of the
given arguments. This following patch fixes the problem. It is been
tested and applies on latest bk.

--- linux-2.6.0-test3-bk6.orig/drivers/s390/net/cu3088.c	2003-08-19 16:19:32.000000000 +0000
+++ linux-2.6.0-test3-bk6/drivers/s390/net/cu3088.c	2003-08-19 16:22:46.000000000 +0000
@@ -64,7 +64,7 @@
 group_write(struct device_driver *drv, const char *buf, size_t count)
 {
 	const char *start, *end;
-	char bus_ids[2][BUS_ID_SIZE], *argv[2];
+	char bus_ids[2][BUS_ID_SIZE+1], *argv[2];
 	int i;
 	int ret;
 	struct ccwgroup_driver *cdrv;
@@ -79,7 +79,7 @@
 
 		if (!(end = strchr(start, delim[i])))
 			return count;
-		len = min_t(ptrdiff_t, BUS_ID_SIZE, end - start);
+		len = min_t(ptrdiff_t, BUS_ID_SIZE, end - start)+1;
 		strlcpy (bus_ids[i], start, len);
 		argv[i] = bus_ids[i];
 		start = end + 1;


memcpy is not an option since the string will be used with strncmp with
a length > BUS_ID_SIZE.

Please apply.

-- 
Guillaume Morin <guillaume@morinfr.org>

     Build a man a fire, and he'll be warm for a day.  Set a man on fire,
         and he'll be warm for the rest of his life. (Terry Pratchett)