linux-kernel - [PATCH 4.9 48/88] mmc: ushc: fix NULL-deref at probe

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Message-Id: <20170328122750.667515331@linuxfoundation.org>
Date:   Tue, 28 Mar 2017 14:31:03 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, David Vrabel <david.vrabel@....com>,
        Johan Hovold <johan@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH 4.9 48/88] mmc: ushc: fix NULL-deref at probe

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <johan@...nel.org>

commit 181302dc7239add8ab1449c23ecab193f52ee6ab upstream.

Make sure to check the number of endpoints to avoid dereferencing a
NULL-pointer should a malicious device lack endpoints.

Fixes: 53f3a9e26ed5 ("mmc: USB SD Host Controller (USHC) driver")
Cc: David Vrabel <david.vrabel@....com>
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mmc/host/ushc.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/mmc/host/ushc.c
+++ b/drivers/mmc/host/ushc.c
@@ -426,6 +426,9 @@ static int ushc_probe(struct usb_interfa
 	struct ushc_data *ushc;
 	int ret;
 
+	if (intf->cur_altsetting->desc.bNumEndpoints < 1)
+		return -ENODEV;
+
 	mmc = mmc_alloc_host(sizeof(struct ushc_data), &intf->dev);
 	if (mmc == NULL)
 		return -ENOMEM;