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[S390] call home: fix local buffer usage in proc handler

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Fix the size of the local buffer and use snprintf to prevent
further miscalculations. Also fix the usage of bitwise vs logic
operations.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott 2009-10-29 15:04:07 +01:00 • committed by Martin Schwidefsky
parent 964fe080d9
commit 3f0b3c33ee
1 changed files with 3 additions and 4 deletions
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7
drivers/s390/char/sclp_async.c
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@ -68,15 +68,14 @@ static int proc_handler_callhome(struct ctl_table *ctl, int write,
{
unsigned long val;
int len, rc;
char buf[2];
char buf[3];
if (!*count | (*ppos && !write)) {
if (!*count || (*ppos && !write)) {
*count = 0;
return 0;
}
if (!write) {
len = sprintf(buf, "%d\n", callhome_enabled);
buf[len] = '\0';
len = snprintf(buf, sizeof(buf), "%d\n", callhome_enabled);
rc = copy_to_user(buffer, buf, sizeof(buf));
if (rc != 0)
return -EFAULT;