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CVE-2016-5829 heap overflow in hiddev (rhbz 1350509 1350513)

This commit is contained in:
Josh Boyer 2016-06-27 11:57:34 -04:00
parent f340e962e7
commit b76c98ddd6
2 changed files with 53 additions and 0 deletions
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44
HID-hiddev-validate-num_values-for-HIDIOCGUSAGES-HID.patch Normal file
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@ -0,0 +1,44 @@
From 93a2001bdfd5376c3dc2158653034c20392d15c5 Mon Sep 17 00:00:00 2001
From: Scott Bauer <sbauer@plzdonthack.me>
Date: Thu, 23 Jun 2016 08:59:47 -0600
Subject: [PATCH] HID: hiddev: validate num_values for HIDIOCGUSAGES,
HIDIOCSUSAGES commands
This patch validates the num_values parameter from userland during the
HIDIOCGUSAGES and HIDIOCSUSAGES commands. Previously, if the report id was set
to HID_REPORT_ID_UNKNOWN, we would fail to validate the num_values parameter
leading to a heap overflow.
Cc: stable@vger.kernel.org
Signed-off-by: Scott Bauer <sbauer@plzdonthack.me>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
drivers/hid/usbhid/hiddev.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/hid/usbhid/hiddev.c b/drivers/hid/usbhid/hiddev.c
index 2f1ddca6f2e0..700145b15088 100644
--- a/drivers/hid/usbhid/hiddev.c
+++ b/drivers/hid/usbhid/hiddev.c
@@ -516,13 +516,13 @@ static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd,
goto inval;
} else if (uref->usage_index >= field->report_count)
goto inval;
-
- else if ((cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) &&
- (uref_multi->num_values > HID_MAX_MULTI_USAGES ||
- uref->usage_index + uref_multi->num_values > field->report_count))
- goto inval;
}
+ if ((cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) &&
+ (uref_multi->num_values > HID_MAX_MULTI_USAGES ||
+ uref->usage_index + uref_multi->num_values > field->report_count))
+ goto inval;
+
switch (cmd) {
case HIDIOCGUSAGE:
uref->value = field->value[uref->usage_index];
--
2.5.5

9
kernel.spec
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@ -650,6 +650,9 @@ Patch727: KEYS-potential-uninitialized-variable.patch
#rhbz 1338025
Patch728: hp-wmi-fix-wifi-cannot-be-hard-unblock.patch
#CVE-2016-5829 rhbz 1350509 1350513
Patch826: HID-hiddev-validate-num_values-for-HIDIOCGUSAGES-HID.patch
# END OF PATCH DEFINITIONS
%endif
@ -1361,6 +1364,9 @@ ApplyPatch KEYS-potential-uninitialized-variable.patch
#rhbz 1338025
ApplyPatch hp-wmi-fix-wifi-cannot-be-hard-unblock.patch
#CVE-2016-5829 rhbz 1350509 1350513
ApplyPatch HID-hiddev-validate-num_values-for-HIDIOCGUSAGES-HID.patch
# END OF PATCH APPLICATIONS
%endif
@ -2210,6 +2216,9 @@ fi
#
#
%changelog
* Mon Jun 27 2016 Josh Boyer <jwboyer@fedoraproject.org>
- CVE-2016-5829 heap overflow in hiddev (rhbz 1350509 1350513)
* Fri Jun 24 2016 Laura Abbott <labbott@fedoraproject.org> - 4.4.14-200
- Linux v4.4.14