net: sched: cls_api: fix tc_chain_fill_node to initialize tcm_info to zero to prevent an info-leak

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When building netlink messages, tc_chain_fill_node() never initializes
the tcm_info field of struct tcmsg. Since the allocation is not zeroed,
kernel heap memory is leaked to userspace through this 4-byte field.

The fix simply zeroes tcm_info alongside the other fields that are
already initialized.

Fixes: 32a4f5ecd7 ("net: sched: introduce chain object to uapi")
Signed-off-by: Yochai Eisenrich <echelonh@gmail.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Link: https://patch.msgid.link/20260328211436.1010152-1-echelonh@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Yochai Eisenrich 2026-03-29 00:14:36 +03:00 • committed by Greg Kroah-Hartman

parent bacc7f3108

commit 71a3eda7e8

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net/sched/cls_api.c

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