[S390] fix broken proc interface for sclp_async

This patch now allows the use of the proc interface to either activate
or deactivate call home on panic.
e.g.  echo 1 > /proc/sys/kernel/callhome
strict_strtoul() requires _either_'\n\0' _or_ '\0' termination.
This was missing and therefore the interface did not recognise valid input.

Signed-off-by: Hans-Joachim Picht <hans@linux.vnet.ibm.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 740fe405c3959f199ca9d393d9d912443653101b..f449c696e5032a3415030ee41cc2c7f462fd0d2a 100644 (file)
--- a/drivers/s390/char/sclp_async.c
+++ b/drivers/s390/char/sclp_async.c
@@ -84,6 +84,7 @@ 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';
                if (strict_strtoul(buf, 0, &val) != 0)
                        return -EINVAL;
                if (val != 0 && val != 1)