>From 952298d9ff21bc8fba3ece36a634a7abad89d912 Mon Sep 17 00:00:00 2001
From: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Date: Tue, 12 Jun 2012 09:53:02 -0700
Subject: [PATCH 3/8] staging: comedi: sanity check num_subdevices parameter
in comedi_alloc_subdevices
It's possible for a couple of the comedi drivers to incorrectly call
comedi_alloc_subdevices with num_subdevices = 0. Add a sanity check
before doing the kcalloc.
Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Cc: Ian Abbott <abbot@xxxxxxxxx>
Cc: Frank Mori Hess <kmhess@xxxxxxxxxxxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/comedi/drivers.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/drivers/staging/comedi/drivers.c b/drivers/staging/comedi/drivers.c
index 87a87dd..4d5da37 100644
--- a/drivers/staging/comedi/drivers.c
+++ b/drivers/staging/comedi/drivers.c
@@ -60,6 +60,8 @@ int comedi_alloc_subdevices(struct comedi_device *dev, int num_subdevices)
{
int i;
+ if (num_subdevices < 1)
+ return -EINVAL;
dev->n_subdevices = num_subdevices;
dev->subdevices =
kcalloc(num_subdevices, sizeof(struct comedi_subdevice),
--
1.7.7
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