Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 5.16 28/37] can: isotp: convert struct tpcon::{idx,len} to unsigned int | Date | Fri, 14 Jan 2022 09:16:42 +0100 |
| |
From: Marc Kleine-Budde <mkl@pengutronix.de>
commit 5f33a09e769a9da0482f20a6770a342842443776 upstream.
In isotp_rcv_ff() 32 bit of data received over the network is assigned to struct tpcon::len. Later in that function the length is checked for the maximal supported length against MAX_MSG_LENGTH.
As struct tpcon::len is an "int" this check does not work, if the provided length overflows the "int".
Later on struct tpcon::idx is compared against struct tpcon::len.
To fix this problem this patch converts both struct tpcon::{idx,len} to unsigned int.
Fixes: e057dd3fc20f ("can: add ISO 15765-2:2016 transport protocol") Link: https://lore.kernel.org/all/20220105132429.1170627-1-mkl@pengutronix.de Cc: stable@vger.kernel.org Acked-by: Oliver Hartkopp <socketcan@hartkopp.net> Reported-by: syzbot+4c63f36709a642f801c5@syzkaller.appspotmail.com Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- net/can/isotp.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/net/can/isotp.c +++ b/net/can/isotp.c @@ -119,8 +119,8 @@ enum { }; struct tpcon { - int idx; - int len; + unsigned int idx; + unsigned int len; u32 state; u8 bs; u8 sn;
| |