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Commit | Line | Data |
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90594201 GKH |
1 | From 181302dc7239add8ab1449c23ecab193f52ee6ab Mon Sep 17 00:00:00 2001 |
2 | From: Johan Hovold <johan@kernel.org> | |
3 | Date: Mon, 13 Mar 2017 13:40:22 +0100 | |
4 | Subject: mmc: ushc: fix NULL-deref at probe | |
5 | ||
6 | From: Johan Hovold <johan@kernel.org> | |
7 | ||
8 | commit 181302dc7239add8ab1449c23ecab193f52ee6ab upstream. | |
9 | ||
10 | Make sure to check the number of endpoints to avoid dereferencing a | |
11 | NULL-pointer should a malicious device lack endpoints. | |
12 | ||
13 | Fixes: 53f3a9e26ed5 ("mmc: USB SD Host Controller (USHC) driver") | |
14 | Cc: David Vrabel <david.vrabel@csr.com> | |
15 | Signed-off-by: Johan Hovold <johan@kernel.org> | |
16 | Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> | |
17 | Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> | |
18 | ||
19 | --- | |
20 | drivers/mmc/host/ushc.c | 3 +++ | |
21 | 1 file changed, 3 insertions(+) | |
22 | ||
23 | --- a/drivers/mmc/host/ushc.c | |
24 | +++ b/drivers/mmc/host/ushc.c | |
25 | @@ -426,6 +426,9 @@ static int ushc_probe(struct usb_interfa | |
26 | struct ushc_data *ushc; | |
27 | int ret; | |
28 | ||
29 | + if (intf->cur_altsetting->desc.bNumEndpoints < 1) | |
30 | + return -ENODEV; | |
31 | + | |
32 | mmc = mmc_alloc_host(sizeof(struct ushc_data), &intf->dev); | |
33 | if (mmc == NULL) | |
34 | return -ENOMEM; |