From: Dan Carpenter <error27@gmail.com>
Date: Fri, 9 Apr 2010 11:42:59 +0000 (+0200)
Subject: [S390] sclp_async: potential buffer overflow
X-Git-Tag: v2.6.34-rc4~10^2~5
X-Git-Url: http://pileus.org/git/?a=commitdiff_plain;h=35ac734f72d846f250c0344913a91f954ea764c3;p=~andy%2Flinux

[S390] sclp_async: potential buffer overflow

"len" hasn't been properly range checked so we shouldn't use it as an
array offset.  This can only be written to by root but it would still be
annoying to accidentally write more than 3 characters and corrupt your
memory.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

diff --git a/drivers/s390/char/sclp_async.c b/drivers/s390/char/sclp_async.c
index 2aecf7f2136..7ad30e72f86 100644
--- a/drivers/s390/char/sclp_async.c
+++ b/drivers/s390/char/sclp_async.c
@@ -85,7 +85,7 @@ static int proc_handler_callhome(struct ctl_table *ctl, int write,
 		rc = copy_from_user(buf, buffer, sizeof(buf));
 		if (rc != 0)
 			return -EFAULT;
-		buf[len - 1] = '\0';
+		buf[sizeof(buf) - 1] = '\0';
 		if (strict_strtoul(buf, 0, &val) != 0)
 			return -EINVAL;
 		if (val != 0 && val != 1)