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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 /net/can/raw.c
parentbc3913a5378cd0ddefd1dfec6917cc12eb23a946 (diff)
downloadlinux-332b05ca7a438f857c61a3c21a88489a21532364.tar.bz2
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>
Diffstat (limited to 'net/can/raw.c')
-rw-r--r--net/can/raw.c3
1 files changed, 3 insertions, 0 deletions
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) {