linux-kernel - [PATCH] staging: comedi: ii_pci20kc: fix usage of uninit scalar in ii20k

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Message-ID: <20140504022609.7b1ba9c1@spike>
Date:	Sun, 4 May 2014 02:26:09 +0200
From:	Christian Engelmayer <cengelma@....at>
To:	devel@...verdev.osuosl.org
Cc:	hsweeten@...ionengravers.com, abbotti@....co.uk,
	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org
Subject: [PATCH] staging: comedi: ii_pci20kc: fix usage of uninit scalar in
 ii20k_attach()

This driver supports the PCI-20001C-1a and PCI-20001C-2a carrier boards.
The -2a version has 32 on-board DIO channels. In case this variant is
detected, local variable 'has_dio' is set accordingly. Otherwise it is
left uninitialized and the following subdevice instantiation depends on
the stack. Detected by Coverity - CID 1077830.

Signed-off-by: Christian Engelmayer <cengelma@....at>
---
Compile tested and applies against branch staging-next of tree
git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
---
 drivers/staging/comedi/drivers/ii_pci20kc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/staging/comedi/drivers/ii_pci20kc.c b/drivers/staging/comedi/drivers/ii_pci20kc.c
index 3558ab3..2516ce8 100644
--- a/drivers/staging/comedi/drivers/ii_pci20kc.c
+++ b/drivers/staging/comedi/drivers/ii_pci20kc.c
@@ -461,6 +461,7 @@ static int ii20k_attach(struct comedi_device *dev,
 	id = readb(devpriv->ioaddr + II20K_ID_REG);
 	switch (id & II20K_ID_MASK) {
 	case II20K_ID_PCI20001C_1A:
+		has_dio = false;
 		break;
 	case II20K_ID_PCI20001C_2A:
 		has_dio = true;
-- 
1.9.1

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