As pointed out by Dan carpenter for the similar pcmuio driver, there is
no need to check the pointer passed to `kfree()`, so remove that check
from `pcmmio_detach()`.
Also, check the `devpriv` (`dev->private`) pointer once, outside the
`for` loop.
Signed-off-by: Ian Abbott <abbotti@xxxxxxxxx>
Cc: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
v2: Removed a duplicate check of `devpriv`. Changed the patch subject
line from "staging: comedi: pcmmio: fix possible NULL deref on detach"
and changed the inaccurate description as there was no bug.
---
drivers/staging/comedi/drivers/pcmmio.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/drivers/staging/comedi/drivers/pcmmio.c b/drivers/staging/comedi/drivers/pcmmio.c
index aa3c030..574443d 100644
--- a/drivers/staging/comedi/drivers/pcmmio.c
+++ b/drivers/staging/comedi/drivers/pcmmio.c
@@ -1156,12 +1156,13 @@ static void pcmmio_detach(struct comedi_device *dev)
struct pcmmio_private *devpriv = dev->private;
int i;
- for (i = 0; i < MAX_ASICS; ++i) {
- if (devpriv && devpriv->asics[i].irq)
- free_irq(devpriv->asics[i].irq, dev);
- }
- if (devpriv && devpriv->sprivs)
+ if (devpriv) {
+ for (i = 0; i < MAX_ASICS; ++i) {
+ if (devpriv->asics[i].irq)
+ free_irq(devpriv->asics[i].irq, dev);
+ }
kfree(devpriv->sprivs);
+ }
comedi_legacy_detach(dev);
}
--
1.8.3.2
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