summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorMarc Kleine-Budde <mkl@pengutronix.de>2016-12-05 11:44:23 +0100
committerMarc Kleine-Budde <mkl@pengutronix.de>2016-12-07 10:45:57 +0100
commit332b05ca7a438f857c61a3c21a88489a21532364 (patch)
treef30e326f3e623c103bc6e9735e7e958a90ecef20
parentbc3913a5378cd0ddefd1dfec6917cc12eb23a946 (diff)
can: raw: raw_setsockopt: limit number of can_filter that can be set
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>
-rw-r--r--include/uapi/linux/can.h1
-rw-r--r--net/can/raw.c3
2 files changed, 4 insertions, 0 deletions
diff --git a/include/uapi/linux/can.h b/include/uapi/linux/can.h
index 9692cda5f8fc..c48d93a28d1a 100644
--- a/include/uapi/linux/can.h
+++ b/include/uapi/linux/can.h
@@ -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 */
diff --git a/net/can/raw.c b/net/can/raw.c
index 972c187d40ab..b075f028d7e2 100644
--- a/net/can/raw.c
+++ b/net/can/raw.c
@@ -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) {