This is a note to let you know that I've just added the patch titled can: isotp: convert struct tpcon::{idx,len} to unsigned int to the 5.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: can-isotp-convert-struct-tpcon-idx-len-to-unsigned-int.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 5f33a09e769a9da0482f20a6770a342842443776 Mon Sep 17 00:00:00 2001 From: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx> Date: Wed, 5 Jan 2022 14:01:12 +0100 Subject: can: isotp: convert struct tpcon::{idx,len} to unsigned int From: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxx Cc: stable@xxxxxxxxxxxxxxx Acked-by: Oliver Hartkopp <socketcan@xxxxxxxxxxxx> Reported-by: syzbot+4c63f36709a642f801c5@xxxxxxxxxxxxxxxxxxxxxxxxx Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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; Patches currently in stable-queue which might be from mkl@xxxxxxxxxxxxxx are queue-5.15/can-isotp-convert-struct-tpcon-idx-len-to-unsigned-int.patch queue-5.15/can-gs_usb-fix-use-of-uninitialized-variable-detach-device-on-reception-of-invalid-usb-data.patch queue-5.15/can-gs_usb-gs_can_start_xmit-zero-initialize-hf-flags-reserved.patch