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staging: kpc2000: prevent underflow in cpld_reconfigure()

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This function should not allow negative values of "wr_val".  If
negatives are allowed then capping the upper bound at 7 is
meaningless.  Let's make it unsigned.

Fixes: 7dc7967fc3 ("staging: kpc2000: add initial set of Daktronics drivers")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200224103325.hrxdnaeqsthplu42@kili.mountain
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2020-02-24 13:33:25 +03:00 committed by Greg Kroah-Hartman
parent 580f57c2cf
commit 72db61d7d1
1 changed files with 2 additions and 2 deletions
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4
drivers/staging/kpc2000/kpc2000/core.c
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@ -110,10 +110,10 @@ static ssize_t cpld_reconfigure(struct device *dev,
const char *buf, size_t count)
{
struct kp2000_device *pcard = dev_get_drvdata(dev);
long wr_val;
unsigned long wr_val;
int rv;
rv = kstrtol(buf, 0, &wr_val);
rv = kstrtoul(buf, 0, &wr_val);
if (rv < 0)
return rv;
if (wr_val > 7)