linux-kernel - [PATCH] staging: line6: do not return 0 from probe if no initialization done

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Message-Id: <1402431770-20131-1-git-send-email-khoroshilov@ispras.ru>
Date:	Wed, 11 Jun 2014 00:22:50 +0400
From:	Alexey Khoroshilov <khoroshilov@...ras.ru>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	ldv-project@...uxtesting.org
Subject: [PATCH] staging: line6: do not return 0 from probe if no initialization done

There is a strange "return 0" in line6_probe() before any initialization of
the module is done. It can lead to NULL pointer dereference in other functions.
The patch proposes to return -ENODEV in this case.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
---
 drivers/staging/line6/driver.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/line6/driver.c b/drivers/staging/line6/driver.c
index ef511c76a6e3..503b2d763595 100644
--- a/drivers/staging/line6/driver.c
+++ b/drivers/staging/line6/driver.c
@@ -663,7 +663,7 @@ static int line6_probe(struct usb_interface *interface,
 	case LINE6_DEVID_POCKETPOD:
 		switch (interface_number) {
 		case 0:
-			return 0;	/* this interface has no endpoints */
+			return -ENODEV;	/* this interface has no endpoints */
 		case 1:
 			alternate = 0;
 			break;
-- 
1.9.1

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