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mmc: ushc: fix NULL-deref at probe

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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@csr.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2017-03-13 13:40:22 +01:00 committed by Greg Kroah-Hartman
parent 2c251e568e
commit dcf879cb9e
1 changed files with 3 additions and 0 deletions
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3
drivers/mmc/host/ushc.c
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@ -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;