[PATCH 4.4 37/76] mmc: ushc: fix NULL-deref at probe

[Greg Kroah-Hartman]

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

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

From: Johan Hovold <jo...@kernel.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.vra...@csr.com>
Signed-off-by: Johan Hovold <jo...@kernel.org>
Signed-off-by: Ulf Hansson <ulf.hans...@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.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;