From: Lee Jones <lee@kernel.org> mainline inclusion from mainline-v7.0-rc5 commit e716edafedad4952fe3a4a273d2e039a84e8681a category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/14579 CVE: CVE-2026-43047 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- It is possible for a malicious (or clumsy) device to respond to a specific report's feature request using a completely different report ID. This can cause confusion in the HID core resulting in nasty side-effects such as OOB writes. Add a check to ensure that the report ID in the response, matches the one that was requested. If it doesn't, omit reporting the raw event and return early. Signed-off-by: Lee Jones <lee@kernel.org> Signed-off-by: Benjamin Tissoires <bentiss@kernel.org> Signed-off-by: Liu Kai <liukai284@huawei.com> --- drivers/hid/hid-multitouch.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c index 6bd95a13eb24..d77ec5711c17 100644 --- a/drivers/hid/hid-multitouch.c +++ b/drivers/hid/hid-multitouch.c @@ -428,12 +428,19 @@ static void mt_get_feature(struct hid_device *hdev, struct hid_report *report) dev_warn(&hdev->dev, "failed to fetch feature %d\n", report->id); } else { + /* The report ID in the request and the response should match */ + if (report->id != buf[0]) { + hid_err(hdev, "Returned feature report did not match the request\n"); + goto free; + } + ret = hid_report_raw_event(hdev, HID_FEATURE_REPORT, buf, size, 0); if (ret) dev_warn(&hdev->dev, "failed to report feature\n"); } +free: kfree(buf); } -- 2.34.1