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[76.119.149.155]) by smtp.gmail.com with ESMTPSA id c70sm438566qke.109.2020.07.20.12.53.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Jul 2020 12:53:36 -0700 (PDT) From: Peilin Ye To: Jiri Kosina , Benjamin Tissoires Cc: Peilin Ye , Dan Carpenter , Greg Kroah-Hartman , syzkaller-bugs@googlegroups.com, linux-kernel-mentees@lists.linuxfoundation.org, linux-usb@vger.kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [Linux-kernel-mentees] [PATCH v2] usbhid: Fix slab-out-of-bounds write in hiddev_ioctl_usage() Date: Mon, 20 Jul 2020 15:52:09 -0400 Message-Id: <20200720195209.4365-1-yepeilin.cs@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200718231218.170730-1-yepeilin.cs@gmail.com> References: <20200718231218.170730-1-yepeilin.cs@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org `uref->usage_index` is not always being properly checked, causing hiddev_ioctl_usage() to go out of bounds under some cases. Fix it. Reported-by: syzbot+34ee1b45d88571c2fa8b@syzkaller.appspotmail.com Link: https://syzkaller.appspot.com/bug?id=f2aebe90b8c56806b050a20b36f51ed6acabe802 Signed-off-by: Peilin Ye --- Change in v2: - Add the same check for the `HIDIOCGUSAGE` case. (Suggested by Dan Carpenter ) drivers/hid/usbhid/hiddev.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/hid/usbhid/hiddev.c b/drivers/hid/usbhid/hiddev.c index 4140dea693e9..4f97e6c12059 100644 --- a/drivers/hid/usbhid/hiddev.c +++ b/drivers/hid/usbhid/hiddev.c @@ -519,12 +519,16 @@ static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd, switch (cmd) { case HIDIOCGUSAGE: + if (uref->usage_index >= field->report_count) + goto inval; uref->value = field->value[uref->usage_index]; if (copy_to_user(user_arg, uref, sizeof(*uref))) goto fault; goto goodreturn; case HIDIOCSUSAGE: + if (uref->usage_index >= field->report_count) + goto inval; field->value[uref->usage_index] = uref->value; goto goodreturn; -- 2.25.1