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[PATCH 4.10 23/27] isdn/gigaset: fix NULL-deref at probe

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

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

From: Johan Hovold <johan@kernel.org>

commit 68c32f9c2a36d410aa242e661506e5b2c2764179 upstream.

Make sure to check the number of endpoints to avoid dereferencing a
NULL-pointer should a malicious device lack endpoints.

Fixes: cf7776dc05b8 ("[PATCH] isdn4linux: Siemens Gigaset drivers - direct USB connection")
Cc: Hansjoerg Lipp <hjlipp@web.de>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/isdn/gigaset/bas-gigaset.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/isdn/gigaset/bas-gigaset.c
+++ b/drivers/isdn/gigaset/bas-gigaset.c
@@ -2317,6 +2317,9 @@ static int gigaset_probe(struct usb_inte
 		return -ENODEV;
 	}
 
+	if (hostif->desc.bNumEndpoints < 1)
+		return -ENODEV;
+
 	dev_info(&udev->dev,
 		 "%s: Device matched (Vendor: 0x%x, Product: 0x%x)\n",
 		 __func__, le16_to_cpu(udev->descriptor.idVendor),

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[PATCH 4.10 00/27] 4.10.6-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-24 19:00 +0100
  [PATCH 4.10 10/27] xprtrdma: Squelch kbuild sparse complaint Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-24 19:00 +0100
  [PATCH 4.10 14/27] hwrng: omap - write registers after enabling the clock Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-24 19:10 +0100
  [PATCH 4.10 12/27] cpufreq: Fix and clean up show_cpuinfo_cur_freq() Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-24 19:10 +0100
  [PATCH 4.10 11/27] NFS prevent double free in async nfs4_exchange_id Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-24 19:10 +0100
  [PATCH 4.10 15/27] hwrng: omap - use devm_clk_get() instead of of_clk_get() Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-24 19:10 +0100
  [PATCH 4.10 06/27] parisc: Fix system shutdown halt Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-24 19:10 +0100
  [PATCH 4.10 23/27] isdn/gigaset: fix NULL-deref at probe Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-24 19:10 +0100
  [PATCH 4.10 03/27] qla2xxx: Fix request queue corruption. Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-24 19:10 +0100
  [PATCH 4.10 25/27] percpu: acquire pcpu_lock when updating pcpu_nr_empty_pop_pages Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-24 19:10 +0100
  [PATCH 4.10 08/27] perf/core: Fix event inheritance on fork() Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-24 19:10 +0100
  [PATCH 4.10 16/27] hwrng: omap - Do not access INTMASK_REG on EIP76 Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-24 19:10 +0100
  [PATCH 4.10 17/27] md/raid1/10: fix potential deadlock Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-24 19:10 +0100
  [PATCH 4.10 13/27] powerpc/boot: Fix zImage TOC alignment Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-24 19:10 +0100
  [PATCH 4.10 04/27] parisc: Optimize flush_kernel_vmap_range and invalidate_kernel_vmap_range Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-24 19:10 +0100
  [PATCH 4.10 09/27] md/r5cache: fix set_syndrome_sources() for data in cache Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-24 19:10 +0100
  [PATCH 4.10 02/27] qla2xxx: Fix memory leak for abts processing Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-24 19:10 +0100
  [PATCH 4.10 01/27] give up on gcc ilog2() constant optimizations Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-24 19:10 +0100
  [PATCH 4.10 19/27] scsi: lpfc: Add shutdown method for kexec Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-24 19:10 +0100
  [PATCH 4.10 05/27] parisc: support R_PARISC_SECREL32 relocation in modules Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-24 19:20 +0100
  [PATCH 4.10 07/27] perf/core: Fix use-after-free in perf_release() Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-24 19:20 +0100
  [PATCH 4.10 22/27] target: Fix VERIFY_16 handling in sbc_parse_cdb Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-24 19:30 +0100
  [PATCH 4.10 20/27] scsi: libiscsi: add lock around task lists to fix list corruption regression Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-24 19:30 +0100
  [PATCH 4.10 18/27] target/pscsi: Fix TYPE_TAPE + TYPE_MEDIMUM_CHANGER export Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-24 19:30 +0100
  [PATCH 4.10 21/27] scsi: mpt3sas: Avoid sleeping in interrupt context Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-24 19:30 +0100
  [PATCH 4.10 24/27] gfs2: Avoid alignment hole in struct lm_lockname Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-24 19:30 +0100
  [PATCH 4.10 26/27] cgroup/pids: remove spurious suspicious RCU usage warning Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-24 19:30 +0100
  Re: [PATCH 4.10 00/27] 4.10.6-stable review Shuah Khan <shuahkh@osg.samsung.com> - 2017-03-25 01:10 +0100
    Re: [PATCH 4.10 00/27] 4.10.6-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-26 10:30 +0200
  Re: [PATCH 4.10 00/27] 4.10.6-stable review Guenter Roeck <linux@roeck-us.net> - 2017-03-25 05:20 +0100
    Re: [PATCH 4.10 00/27] 4.10.6-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-26 11:10 +0200

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