From patchwork Wed Jun 26 13:46:22 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Tissoires X-Patchwork-Id: 13712949 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 9067A18412F; Wed, 26 Jun 2024 13:46:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719409607; cv=none; b=FVGehEvVshVK/uy+D+qk8hIed+3H0hOPA3JoJzCSLoQvOe7o9U2HXy9/s5PbS+WRmpYejkdtFiNmS8+udfis6yCmYRUmEVCbTlAchR2Pg4f/R9DhrxOtPk0ZzQCMg+j7+5DfMC8A947/78ArinpYG+zwQ2xZk8mXA9NFQBfBS7Y= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719409607; c=relaxed/simple; bh=GtU69AclojvTXAELtzrkbmBbNsYZg/7S9LDXSSiB/1k=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=kSQl4XF14aLbz/RrrWjGW+v6LtpYB59Ni2XS0yhb2pqLZdT6tp5zI1lMk56yAM5B0aIoaUiWRzOpEn7ysMNQgG605rwcLXHZrOI+Pb5WecjHHSfjY/mVrdXgg7aWMDsHN66QHPJlR+VAW0yVcUadscjVLy5t13Wu4cLj8ABiXCs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=qp4VFuwu; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="qp4VFuwu" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1C897C4AF0A; Wed, 26 Jun 2024 13:46:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1719409607; bh=GtU69AclojvTXAELtzrkbmBbNsYZg/7S9LDXSSiB/1k=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=qp4VFuwuqQaoyDzGEp8H4cMEdE/DyvHDmXRCYpnYMKFAARwNxG1H5T/1Pj1NGH/Ec oLDbDyNEGULy5qAvsT34TXfQ6taL/nyL119KOoBcJNsgj7IgkVM5IFmjAGu+mQnqM3 KmfJwdyHUVNmR71fEHIDj/5G+F4wrGetdyknc/V/l4IzGlkwZmUXBGSs40s81Rdght SJpGYjsrINsUGC2yU4dk4tcKpXsuczU0PljrxIqRUx8CF1DDrlfh0CsPrNdQkTdEIy o3lz8jOO9rm8VqwE2EhJP9WtZ0/ICXlOvs4Fgij6GnbLqV8/mgVrZDEA9UMs9XNxnP loX6M31R0o7AA== From: Benjamin Tissoires Date: Wed, 26 Jun 2024 15:46:22 +0200 Subject: [PATCH HID v2 01/13] HID: bpf: fix dispatch_hid_bpf_device_event uninitialized ret value Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240626-hid_hw_req_bpf-v2-1-cfd60fb6c79f@kernel.org> References: <20240626-hid_hw_req_bpf-v2-0-cfd60fb6c79f@kernel.org> In-Reply-To: <20240626-hid_hw_req_bpf-v2-0-cfd60fb6c79f@kernel.org> To: Jiri Kosina , Alexei Starovoitov , Shuah Khan , Jonathan Corbet Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-doc@vger.kernel.org, Benjamin Tissoires , Dan Carpenter X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1719409602; l=1348; i=bentiss@kernel.org; s=20230215; h=from:subject:message-id; bh=GtU69AclojvTXAELtzrkbmBbNsYZg/7S9LDXSSiB/1k=; b=UlCY4s8u+cxp33zBsPAQOuYqWQ0xbzGfujIKMNFxsFyCRVxN9Prsc5k487uOwZtlTQZBv2XnV hvRRZQtklceBKKbswmEGnsMv14WUwM5RfBSXuXIn/PkZt9vH1uqDdFz X-Developer-Key: i=bentiss@kernel.org; a=ed25519; pk=7D1DyAVh6ajCkuUTudt/chMuXWIJHlv2qCsRkIizvFw= Looks like if a bpf program gets inserted and then removed, hdev->bpf.device_data is then allocated, but the loop iterating over the bpf program is never assigning ret. This is a problem and also revealed another bug in which only the last value of ret was checked. This effectively meant than only the last program in the chain could change the size of the incoming buffer. Reported-by: Dan Carpenter Link: https://lore.kernel.org/all/00f7b624-219f-4a05-a7ad-5335f15a41c7@moroto.mountain Fixes: 4a86220e046d ("HID: bpf: remove tracing HID-BPF capability") Signed-off-by: Benjamin Tissoires --- no changes in v2 --- drivers/hid/bpf/hid_bpf_dispatch.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c index 06cc628e7bb4..b7b11a7c69db 100644 --- a/drivers/hid/bpf/hid_bpf_dispatch.c +++ b/drivers/hid/bpf/hid_bpf_dispatch.c @@ -57,11 +57,12 @@ dispatch_hid_bpf_device_event(struct hid_device *hdev, enum hid_report_type type } if (ret) - ctx_kern.ctx.retval = ret; + ctx_kern.ctx.size = ret; } } rcu_read_unlock(); + ret = ctx_kern.ctx.size; if (ret) { if (ret > ctx_kern.ctx.allocated_size) return ERR_PTR(-EINVAL);