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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;
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