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watchdog: ts72xx_wdt: locking bug in ioctl

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commit 8612ed0d97 upstream.

Calling the WDIOC_GETSTATUS & WDIOC_GETBOOTSTATUS and twice will cause a
interruptible deadlock.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Cc: Jonghwan Choi <jhbird.choi@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2013-08-23 11:40:59 +03:00 committed by Greg Kroah-Hartman
parent 8958138db8
commit d3c113cbc8
1 changed files with 2 additions and 1 deletions
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3
drivers/watchdog/ts72xx_wdt.c
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@ -310,7 +310,8 @@ static long ts72xx_wdt_ioctl(struct file *file, unsigned int cmd,
case WDIOC_GETSTATUS:
case WDIOC_GETBOOTSTATUS:
return put_user(0, p);
error = put_user(0, p);
break;
case WDIOC_KEEPALIVE:
ts72xx_wdt_kick(wdt);