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https://github.com/Divested-Mobile/DivestOS-Build.git
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106 lines
4.4 KiB
Diff
106 lines
4.4 KiB
Diff
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From f043bfc98c193c284e2cd768fefabe18ac2fed9b Mon Sep 17 00:00:00 2001
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From: Jaejoong Kim <climbbb.kim@gmail.com>
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Date: Thu, 28 Sep 2017 19:16:30 +0900
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Subject: [PATCH] HID: usbhid: fix out-of-bounds bug
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The hid descriptor identifies the length and type of subordinate
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descriptors for a device. If the received hid descriptor is smaller than
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the size of the struct hid_descriptor, it is possible to cause
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out-of-bounds.
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In addition, if bNumDescriptors of the hid descriptor have an incorrect
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value, this can also cause out-of-bounds while approaching hdesc->desc[n].
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So check the size of hid descriptor and bNumDescriptors.
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BUG: KASAN: slab-out-of-bounds in usbhid_parse+0x9b1/0xa20
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Read of size 1 at addr ffff88006c5f8edf by task kworker/1:2/1261
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CPU: 1 PID: 1261 Comm: kworker/1:2 Not tainted
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4.14.0-rc1-42251-gebb2c2437d80 #169
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Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
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Workqueue: usb_hub_wq hub_event
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Call Trace:
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__dump_stack lib/dump_stack.c:16
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dump_stack+0x292/0x395 lib/dump_stack.c:52
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print_address_description+0x78/0x280 mm/kasan/report.c:252
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kasan_report_error mm/kasan/report.c:351
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kasan_report+0x22f/0x340 mm/kasan/report.c:409
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__asan_report_load1_noabort+0x19/0x20 mm/kasan/report.c:427
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usbhid_parse+0x9b1/0xa20 drivers/hid/usbhid/hid-core.c:1004
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hid_add_device+0x16b/0xb30 drivers/hid/hid-core.c:2944
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usbhid_probe+0xc28/0x1100 drivers/hid/usbhid/hid-core.c:1369
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usb_probe_interface+0x35d/0x8e0 drivers/usb/core/driver.c:361
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really_probe drivers/base/dd.c:413
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driver_probe_device+0x610/0xa00 drivers/base/dd.c:557
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__device_attach_driver+0x230/0x290 drivers/base/dd.c:653
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bus_for_each_drv+0x161/0x210 drivers/base/bus.c:463
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__device_attach+0x26e/0x3d0 drivers/base/dd.c:710
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device_initial_probe+0x1f/0x30 drivers/base/dd.c:757
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bus_probe_device+0x1eb/0x290 drivers/base/bus.c:523
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device_add+0xd0b/0x1660 drivers/base/core.c:1835
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usb_set_configuration+0x104e/0x1870 drivers/usb/core/message.c:1932
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generic_probe+0x73/0xe0 drivers/usb/core/generic.c:174
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usb_probe_device+0xaf/0xe0 drivers/usb/core/driver.c:266
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really_probe drivers/base/dd.c:413
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driver_probe_device+0x610/0xa00 drivers/base/dd.c:557
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__device_attach_driver+0x230/0x290 drivers/base/dd.c:653
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bus_for_each_drv+0x161/0x210 drivers/base/bus.c:463
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__device_attach+0x26e/0x3d0 drivers/base/dd.c:710
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device_initial_probe+0x1f/0x30 drivers/base/dd.c:757
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bus_probe_device+0x1eb/0x290 drivers/base/bus.c:523
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device_add+0xd0b/0x1660 drivers/base/core.c:1835
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usb_new_device+0x7b8/0x1020 drivers/usb/core/hub.c:2457
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hub_port_connect drivers/usb/core/hub.c:4903
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hub_port_connect_change drivers/usb/core/hub.c:5009
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port_event drivers/usb/core/hub.c:5115
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hub_event+0x194d/0x3740 drivers/usb/core/hub.c:5195
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process_one_work+0xc7f/0x1db0 kernel/workqueue.c:2119
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worker_thread+0x221/0x1850 kernel/workqueue.c:2253
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kthread+0x3a1/0x470 kernel/kthread.c:231
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ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431
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Cc: stable@vger.kernel.org
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Reported-by: Andrey Konovalov <andreyknvl@google.com>
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Signed-off-by: Jaejoong Kim <climbbb.kim@gmail.com>
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Tested-by: Andrey Konovalov <andreyknvl@google.com>
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Acked-by: Alan Stern <stern@rowland.harvard.edu>
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Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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---
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drivers/hid/usbhid/hid-core.c | 12 +++++++++++-
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1 file changed, 11 insertions(+), 1 deletion(-)
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diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
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index 089bad8a9a21d..045b5da9b9928 100644
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--- a/drivers/hid/usbhid/hid-core.c
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+++ b/drivers/hid/usbhid/hid-core.c
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@@ -975,6 +975,8 @@ static int usbhid_parse(struct hid_device *hid)
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unsigned int rsize = 0;
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char *rdesc;
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int ret, n;
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+ int num_descriptors;
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+ size_t offset = offsetof(struct hid_descriptor, desc);
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quirks = usbhid_lookup_quirk(le16_to_cpu(dev->descriptor.idVendor),
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le16_to_cpu(dev->descriptor.idProduct));
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@@ -997,10 +999,18 @@ static int usbhid_parse(struct hid_device *hid)
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return -ENODEV;
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}
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+ if (hdesc->bLength < sizeof(struct hid_descriptor)) {
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+ dbg_hid("hid descriptor is too short\n");
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+ return -EINVAL;
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+ }
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+
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hid->version = le16_to_cpu(hdesc->bcdHID);
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hid->country = hdesc->bCountryCode;
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- for (n = 0; n < hdesc->bNumDescriptors; n++)
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+ num_descriptors = min_t(int, hdesc->bNumDescriptors,
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+ (hdesc->bLength - offset) / sizeof(struct hid_class_descriptor));
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+
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+ for (n = 0; n < num_descriptors; n++)
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if (hdesc->desc[n].bDescriptorType == HID_DT_REPORT)
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rsize = le16_to_cpu(hdesc->desc[n].wDescriptorLength);
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