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 6A5E23FE653; Thu, 16 Jul 2026 14:35:10 +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=1784212511; cv=none; b=aj7tSV2/ORjPbtB7hA5mUVijWDh88skm8TCY2htliRinmLFf5RA5C1VOeALACXCyxxcggsKmQtft2jzix1604L62O3XbwWYKJFiT+rtidhADPJEhUD2abW7v/7Bjbyfab4MtIE8JfmZa1LjoM0e2LIBb45ERTN0ljhocKp5gz7g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784212511; c=relaxed/simple; bh=8Gf4a6OmZJuWnDi4+qobt88xFpbVgktm45k8f4FfJEE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=HIb8FHN4xQMAFRjACPuVjEnMqJOzBADhz4Rrmpx7wX0N3C9HMC6OLQK0p98lq2uerZypbfjD2R62TLSZ1+1S+NcyNIPNHL7Au2b6FqnfFBtba3d01oVY9lvF7KMPWwEk59LqtG9Nrvs2f3BQi19f0NbPoz3rd3TC6PNGXKmIxU8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=yW1ydphA; 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="yW1ydphA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CFA4B1F000E9; Thu, 16 Jul 2026 14:35:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784212510; bh=9ZD5ZjLVZNF2GEhICMXq5dKR20bBjts8ys4+gnonOBY=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=yW1ydphATn6R+7I/1v2WkxmOKOFaVVgtpuNmXt6zv83M5zdQIc7+rAXqzd0LJdm69 MZho9r4cpj8guzrwV+d/C0VJ4SIWY4gwWMiZI0ZzrhDYpFWx0KJJKT+aH6gGNIFQyt HvCTypmW6fow1gUDwAuePCLL2JD+46nx+YM+480o= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Bryam Vargas , Dmitry Torokhov Subject: [PATCH 6.12 335/349] Input: iforce - bound the device-reported force-feedback effect index Date: Thu, 16 Jul 2026 15:34:29 +0200 Message-ID: <20260716133040.809606575@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260716133033.287196923@linuxfoundation.org> References: <20260716133033.287196923@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 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Bryam Vargas commit 0e9943d2e4c63496b6ca84bc66fd3c71d40558e2 upstream. iforce_process_packet() handles a status report (packet id 0x02) by taking a force-feedback effect index straight from the device wire and using it to address the per-effect state array: i = data[1] & 0x7f; if (data[1] & 0x80) { if (!test_and_set_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) ... } else if (test_and_clear_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) { ... } The index is masked only with 0x7f, so it ranges 0..127, but core_effects[] holds only IFORCE_EFFECTS_MAX (32) entries. For an index of 32..127 the test_and_set_bit()/test_and_clear_bit() is an out-of-bounds single-bit read-modify-write past the array. core_effects[] is the second-to-last member of struct iforce, so the write lands in the trailing members and beyond the embedding kzalloc()'d iforce_serio / iforce_usb object. data[1] is unvalidated device payload on both transports (the USB interrupt endpoint and serio), and the status path is not gated on force feedback being present, so a malicious or counterfeit device can set or clear a bit at an attacker-chosen offset past the object. Reject an out-of-range index instead of indexing with it. Bound against the array dimension IFORCE_EFFECTS_MAX rather than dev->ff->max_effects so the check guarantees memory safety regardless of how many effects the device registered. A legitimate "effect started/stopped" status always carries an index below IFORCE_EFFECTS_MAX, so well-formed devices are unaffected; the neighbouring mark_core_as_ready() loop is already bounded and is left untouched. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Bryam Vargas Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260613-b4-disp-4828d263-v1-1-02320e1a89dd@proton.me Signed-off-by: Dmitry Torokhov Signed-off-by: Greg Kroah-Hartman --- drivers/input/joystick/iforce/iforce-packets.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) --- a/drivers/input/joystick/iforce/iforce-packets.c +++ b/drivers/input/joystick/iforce/iforce-packets.c @@ -192,14 +192,18 @@ void iforce_process_packet(struct iforce /* Check if an effect was just started or stopped */ i = data[1] & 0x7f; - if (data[1] & 0x80) { - if (!test_and_set_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) { - /* Report play event */ - input_report_ff_status(dev, i, FF_STATUS_PLAYING); + if (i < IFORCE_EFFECTS_MAX) { + if (data[1] & 0x80) { + if (!test_and_set_bit(FF_CORE_IS_PLAYED, + iforce->core_effects[i].flags)) { + /* Report play event */ + input_report_ff_status(dev, i, FF_STATUS_PLAYING); + } + } else if (test_and_clear_bit(FF_CORE_IS_PLAYED, + iforce->core_effects[i].flags)) { + /* Report stop event */ + input_report_ff_status(dev, i, FF_STATUS_STOPPED); } - } else if (test_and_clear_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) { - /* Report stop event */ - input_report_ff_status(dev, i, FF_STATUS_STOPPED); } for (j = 3; j < len; j += 2)