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authorSebastian Ott <sebott@linux.vnet.ibm.com>2016-08-19 19:57:49 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2016-09-20 14:26:32 +0200
commitf622b517563b0d3be6c41e932124e0b717149ad8 (patch)
treef4e6b40824f1ca63d790c6487dfd03395140941c
parenteed5c4b117d1f77553d517072584c4ac779af0ba (diff)
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>
-rw-r--r--drivers/s390/char/vmur.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/s390/char/vmur.c b/drivers/s390/char/vmur.c
index 6c30e93ab8fa..ff18f373af9a 100644
--- a/drivers/s390/char/vmur.c
+++ b/drivers/s390/char/vmur.c
@@ -306,10 +306,11 @@ static void ur_int_handler(struct ccw_device *cdev, unsigned long intparm,
{
struct urdev *urd;
- TRACE("ur_int_handler: intparm=0x%lx cstat=%02x dstat=%02x res=%u\n",
- intparm, irb->scsw.cmd.cstat, irb->scsw.cmd.dstat,
- irb->scsw.cmd.count);
-
+ if (!IS_ERR(irb)) {
+ TRACE("ur_int_handler: intparm=0x%lx cstat=%02x dstat=%02x res=%u\n",
+ intparm, irb->scsw.cmd.cstat, irb->scsw.cmd.dstat,
+ irb->scsw.cmd.count);
+ }
if (!intparm) {
TRACE("ur_int_handler: unsolicited interrupt\n");
return;

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