From d9779d7db2ce7684948431007ad06fa6cca164e7 Mon Sep 17 00:00:00 2001 From: Dongliang Mu Date: Tue, 27 Sep 2022 21:06:11 +0800 Subject: [PATCH] HID: bigben: fix slab-out-of-bounds Write in bigben_probe stable inclusion from stable-v5.10.121 commit 296f8ca0f73f5268cd9b85cf72ff783596b2264e category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5L6CQ Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=296f8ca0f73f5268cd9b85cf72ff783596b2264e -------------------------------- [ Upstream commit fc4ef9d5724973193bfa5ebed181dba6de3a56db ] There is a slab-out-of-bounds Write bug in hid-bigbenff driver. The problem is the driver assumes the device must have an input but some malicious devices violate this assumption. Fix this by checking hid_device's input is non-empty before its usage. Reported-by: syzkaller Signed-off-by: Dongliang Mu Signed-off-by: Jiri Kosina Signed-off-by: Sasha Levin Signed-off-by: Zheng Zengkai Acked-by: Xie XiuQi --- drivers/hid/hid-bigbenff.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/hid/hid-bigbenff.c b/drivers/hid/hid-bigbenff.c index 74ad8bf98bfd..e8c5e3ac9fff 100644 --- a/drivers/hid/hid-bigbenff.c +++ b/drivers/hid/hid-bigbenff.c @@ -347,6 +347,12 @@ static int bigben_probe(struct hid_device *hid, bigben->report = list_entry(report_list->next, struct hid_report, list); + if (list_empty(&hid->inputs)) { + hid_err(hid, "no inputs found\n"); + error = -ENODEV; + goto error_hw_stop; + } + hidinput = list_first_entry(&hid->inputs, struct hid_input, list); set_bit(FF_RUMBLE, hidinput->input->ffbit); -- GitLab