Messages in this thread Patch in this message | | | Date | Sun, 28 Feb 2016 17:44:09 +0200 | From | "Michael S. Tsirkin" <> | Subject | [PATCH for-4.5] watchdog/rc32434_wdt: fix ioctl error handling |
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Calling return copy_to_user(...) in an ioctl will not do the right thing if there's a pagefault: copy_to_user returns the number of bytes not copied in this case.
Fix up watchdog/rc32434_wdt to do return copy_to_user(...)) ? -EFAULT : 0;
instead.
Cc: stable@vger.kernel.org Signed-off-by: Michael S. Tsirkin <mst@redhat.com> ---
Untested.
drivers/watchdog/rc32434_wdt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/watchdog/rc32434_wdt.c b/drivers/watchdog/rc32434_wdt.c index 71e78ef..3a75f3b 100644 --- a/drivers/watchdog/rc32434_wdt.c +++ b/drivers/watchdog/rc32434_wdt.c @@ -237,7 +237,7 @@ static long rc32434_wdt_ioctl(struct file *file, unsigned int cmd, return -EINVAL; /* Fall through */ case WDIOC_GETTIMEOUT: - return copy_to_user(argp, &timeout, sizeof(int)); + return copy_to_user(argp, &timeout, sizeof(int)) ? -EFAULT : 0; default: return -ENOTTY; } -- MST
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