can: raw: raw_setsockopt: limit number of can_filter that can be set
authorMarc Kleine-Budde <mkl@pengutronix.de>
Mon, 5 Dec 2016 10:44:23 +0000 (11:44 +0100)
committerMarc Kleine-Budde <mkl@pengutronix.de>
Wed, 7 Dec 2016 09:45:57 +0000 (10:45 +0100)
This patch adds a check to limit the number of can_filters that can be
set via setsockopt on CAN_RAW sockets. Otherwise allocations > MAX_ORDER
are not prevented resulting in a warning.

Reference: https://lkml.org/lkml/2016/12/2/230

Reported-by: Andrey Konovalov <andreyknvl@google.com>
Tested-by: Andrey Konovalov <andreyknvl@google.com>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
include/uapi/linux/can.h
net/can/raw.c

index 9692cda5f8fc2fe7789de59f93281cf4c0bd2a5e..c48d93a28d1acbb905b5d62cb2e8436c20ec8c7e 100644 (file)
@@ -196,5 +196,6 @@ struct can_filter {
 };
 
 #define CAN_INV_FILTER 0x20000000U /* to be set in can_filter.can_id */
+#define CAN_RAW_FILTER_MAX 512 /* maximum number of can_filter set via setsockopt() */
 
 #endif /* !_UAPI_CAN_H */
index 972c187d40abb0f54a30a076e60359a5f1878a0c..b075f028d7e23958e9433a4b19f4475ad930b547 100644 (file)
@@ -499,6 +499,9 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
                if (optlen % sizeof(struct can_filter) != 0)
                        return -EINVAL;
 
+               if (optlen > CAN_RAW_FILTER_MAX * sizeof(struct can_filter))
+                       return -EINVAL;
+
                count = optlen / sizeof(struct can_filter);
 
                if (count > 1) {