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From: Johan Hovold <johan@kernel.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: devel@driverdev.osuosl.org, linux-usb@vger.kernel.org,
	linux-kernel@vger.kernel.org, stable <stable@vger.kernel.org>,
	Johan Hovold <johan@kernel.org>, Tilman Schmidt <tilman@imap.cc>
Subject: [PATCH v2 2/3] staging: gigaset: fix illegal free on probe errors
Date: Mon,  2 Dec 2019 09:56:09 +0100
Message-ID: <20191202085610.12719-3-johan@kernel.org> (raw)
In-Reply-To: <20191202085610.12719-1-johan@kernel.org>

The driver failed to initialise its receive-buffer pointer, something
which could lead to an illegal free on late probe errors.

Fix this by making sure to clear all driver data at allocation.

Fixes: 2032e2c2309d ("usb_gigaset: code cleanup")
Cc: stable <stable@vger.kernel.org>     # 2.6.33
Cc: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/staging/isdn/gigaset/usb-gigaset.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/staging/isdn/gigaset/usb-gigaset.c b/drivers/staging/isdn/gigaset/usb-gigaset.c
index 5e393e7dde45..a84722d83bc6 100644
--- a/drivers/staging/isdn/gigaset/usb-gigaset.c
+++ b/drivers/staging/isdn/gigaset/usb-gigaset.c
@@ -571,8 +571,7 @@ static int gigaset_initcshw(struct cardstate *cs)
 {
 	struct usb_cardstate *ucs;
 
-	cs->hw.usb = ucs =
-		kmalloc(sizeof(struct usb_cardstate), GFP_KERNEL);
+	cs->hw.usb = ucs = kzalloc(sizeof(struct usb_cardstate), GFP_KERNEL);
 	if (!ucs) {
 		pr_err("out of memory\n");
 		return -ENOMEM;
@@ -584,9 +583,6 @@ static int gigaset_initcshw(struct cardstate *cs)
 	ucs->bchars[3] = 0;
 	ucs->bchars[4] = 0x11;
 	ucs->bchars[5] = 0x13;
-	ucs->bulk_out_buffer = NULL;
-	ucs->bulk_out_urb = NULL;
-	ucs->read_urb = NULL;
 	tasklet_init(&cs->write_tasklet,
 		     gigaset_modem_fill, (unsigned long) cs);
 
-- 
2.24.0

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Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-02  8:56 [PATCH v2 0/3] staging: gigaset: fix crashes on probe Johan Hovold
2019-12-02  8:56 ` [PATCH v2 1/3] staging: gigaset: fix general protection fault " Johan Hovold
2019-12-02  8:56 ` Johan Hovold [this message]
2019-12-02  8:56 ` [PATCH v2 3/3] staging: gigaset: add endpoint-type sanity check Johan Hovold

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