From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9D8A4439F71; Mon, 17 Aug 2026 14:35:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786977357; cv=none; b=V4CKVB890ljkvt2kmVBJlMjriE+PsnTrUVJZ4Z7bHQYShM4bxQJ/vWicynNzlBZPRbTaKkrmCTwYcErpw1Natthhd6Ea1dOBHuB1sCQsWnoofZli2kmAclbAWV1iJ1vvzZmtY7Ji/uBKzQeAPvCrnn1D7T5XamdlZFK9oLM072w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786977357; c=relaxed/simple; bh=v1novtSB2W5Pxyf17JpD+H3+Sga3dqeegWgrt1ULtL8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=uqcZEq1o0VErYjsBj13GZOlZpf6dTqXzC9fYmv3cQ1Djwo2ViOIReBAg9ufyqQrle1EGNZoYAbQXKcI7DDVwW5iA8g9F6K2E8eTiK89JXlKJqJ1WtefkUZouRATWTw0mhbj+Ro/1ssA0asS/2gs2oRe3moRy9zYPpw0hv28w0CM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=S18IepE2; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="S18IepE2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 180B91F00A3D; Mon, 17 Aug 2026 14:35:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786977354; bh=6bAKpRIzRhoy6DlQJndOyf11b4LpvOx+I/mJ8oIuSDo=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=S18IepE2ZruiPIkBcqHJqyWTdR5PA3u07Ais52vlRBX7zoegEFvV+aAUFzEdQdGQJ ABvMkkCPhFSBhIbtRhZiVULy7/0VgkPxGm4uHLjfS6Yi/OBSF/Q7uW64fuEwg8pLJy FE+FK4BS0b7XYklzE6zSTVH6JaHx2E0xDMnIZvLY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Sangho Lee , Luiz Augusto von Dentz Subject: [PATCH 5.15 299/456] Bluetooth: HIDP: validate numbered report payloads Date: Mon, 17 Aug 2026 15:31:29 +0200 Message-ID: <20260817132551.520331889@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260817132539.792407575@linuxfoundation.org> References: <20260817132539.792407575@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sangho Lee commit 34f53d27b81a16a02828c8fdfa4e02badc326f17 upstream. When hidp_get_raw_report() waits for a numbered report, hidp_process_data() compares the expected report number with skb->data[0]. A connected HIDP peer can reply with only a DATA transaction header, leaving the skb empty after the header is removed. KMSAN reports an uninitialized-value use in hidp_session_run(), with the value originating in __alloc_skb() through vhci_write(). The transaction header checks remove the empty-frame reports, but this report remains until the payload check is added. The comparison can also consume a peer-controlled byte beyond the declared L2CAP PDU. A DATA | FEATURE response followed by an extra 0x01 byte made the current code accept that byte as report ID 1 and complete HIDIOCGFEATURE with a zero-byte result. With this change the malformed response is rejected with -EIO, while a subsequent valid response still succeeds. Require a payload byte before comparing a numbered report ID. Unnumbered reports continue to accept an empty payload. Fixes: 0ff1731a1ae5 ("HID: bt: Add support for hidraw HIDIOCGFEATURE and HIDIOCSFEATURE") Cc: stable@vger.kernel.org Signed-off-by: Sangho Lee Signed-off-by: Luiz Augusto von Dentz Signed-off-by: Greg Kroah-Hartman --- net/bluetooth/hidp/core.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) --- a/net/bluetooth/hidp/core.c +++ b/net/bluetooth/hidp/core.c @@ -546,9 +546,10 @@ static int hidp_process_data(struct hidp } if (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) && - param == session->waiting_report_type) { + param == session->waiting_report_type) { if (session->waiting_report_number < 0 || - session->waiting_report_number == skb->data[0]) { + (skb->len && + session->waiting_report_number == skb->data[0])) { /* hidp_get_raw_report() is waiting on this report. */ session->report_return = skb; done_with_skb = 0;