From: Johan Hovold <johan@kernel.org>
To: Ulf Hansson <ulf.hansson@linaro.org>
Cc: linux-mmc@vger.kernel.org, linux-usb@vger.kernel.org,
linux-kernel@vger.kernel.org, Johan Hovold <johan@kernel.org>,
stable <stable@vger.kernel.org>,
David Vrabel <david.vrabel@csr.com>
Subject: [PATCH] mmc: ushc: fix NULL-deref at probe
Date: Mon, 13 Mar 2017 13:40:22 +0100 [thread overview]
Message-ID: <20170313124022.28401-1-johan@kernel.org> (raw)
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: stable <stable@vger.kernel.org> # 2.6.37
Cc: David Vrabel <david.vrabel@csr.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
---
drivers/mmc/host/ushc.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/mmc/host/ushc.c b/drivers/mmc/host/ushc.c
index d2c386f09d69..1d843357422e 100644
--- a/drivers/mmc/host/ushc.c
+++ b/drivers/mmc/host/ushc.c
@@ -426,6 +426,9 @@ static int ushc_probe(struct usb_interface *intf, const struct usb_device_id *id
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;
--
2.12.0
next reply other threads:[~2017-03-13 12:40 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-13 12:40 Johan Hovold [this message]
2017-03-16 14:46 ` [PATCH] mmc: ushc: fix NULL-deref at probe Ulf Hansson
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