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s390/vmur: fix irq pointer dereference in int handler 

"irq" in vmur's int handler can be an error pointer. Don't dereference
this pointer in that case.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
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 2016-08-19 19:57:49 +02:00 committed by Martin Schwidefsky
parent eed5c4b117
commit f622b51756
1 changed files with 5 additions and 4 deletions
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3
drivers/s390/char/vmur.c
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@ -306,10 +306,11 @@ static void ur_int_handler(struct ccw_device *cdev, unsigned long intparm,
{ {
struct urdev *urd; struct urdev *urd;
if (!IS_ERR(irb)) {
TRACE("ur_int_handler: intparm=0x%lx cstat=%02x dstat=%02x res=%u\n", TRACE("ur_int_handler: intparm=0x%lx cstat=%02x dstat=%02x res=%u\n",
intparm, irb->scsw.cmd.cstat, irb->scsw.cmd.dstat, intparm, irb->scsw.cmd.cstat, irb->scsw.cmd.dstat,
irb->scsw.cmd.count); irb->scsw.cmd.count);
}
if (!intparm) { if (!intparm) {
TRACE("ur_int_handler: unsolicited interrupt\n"); TRACE("ur_int_handler: unsolicited interrupt\n");
return; return;