From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f176.google.com (mail-pl1-f176.google.com [209.85.214.176]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 021A1471D02 for ; Fri, 21 Aug 2026 12:19:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.176 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787314766; cv=none; b=VTJLvET+C1d19T5DZy6T2QmZmFl/YEVozgmsn30vPjbc9Brdsb4N+sATHwgV0gOWNdUeGPg67EE9kYWqs1mZU23Uv45v59ksfJoBqL2hQ0/FDsjxpx//FrFEIzoZJWDsbwxO1M4OxgsvjmfW9z+g/1newpmz5QCIZUeugmLJ5a8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787314766; c=relaxed/simple; bh=/X7C+wc+bNlFX5VQk77g+9xZVi4dtlKTTZSaa/XXUjo=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=n8B2wiTCSzu42kQ7LcFX8lPDzCxaHQMuv/ESc5q3/T7udHY7wQS/k8TzMy098QQlmLODWm6ZzYtxD3fymshv+5nm6K2h/Nn5poSuBUOvYg1EBGEG7xTYUUOnwiS8aMm5HssksPuO9uwtm7VQNR1dpg88mNcB1FUObb0PhRDxpB0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=kTUX8z4L; arc=none smtp.client-ip=209.85.214.176 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="kTUX8z4L" Received: by mail-pl1-f176.google.com with SMTP id d9443c01a7336-2cca0c5799eso7978255ad.0 for ; Fri, 21 Aug 2026 05:19:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1787314759; x=1787919559; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to:content-type; bh=dtJmOeUQTMpLnSgDqruIxWyKaSSwGkNvswm0ArNYHq0=; b=kTUX8z4LVIbDOjvIGKQ3RZzBcouFUNBOFtheQQ60KO6f0dLURBpM8ZTHs82IdCzlik zQrDeTss/Ynt7i+9Tfzfj56pX3MmrIaf7UBAvLXJQwSfwYrg88MCGbvMYToaJR/++Lp1 LDmvtss1BHBHPlOM+RChsYMPHCBlatMheIqp2A0lxOnIlH5fozgFG9NL44KKYzq7hp/Z dp+HVF2ntELkWrCp1JlUWxoe6JUq9P6QvoL+oCgXR2RLpnWP0xmyUYVPVRyDjW5zbh9U NuDl4tKFRxcvYk3qDb+4INm3GwAcjcYh67SvxYAVvbD0GYiS8OijfHU5Y8IjbFlfS8gZ eoEA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1787314759; x=1787919559; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=dtJmOeUQTMpLnSgDqruIxWyKaSSwGkNvswm0ArNYHq0=; b=T4YEGJE1FI4/UFLBzBbVnsooomgKsqaMmjLT236BrqrFQJOYK2ukXKeo25oeGcBiin cVYcCkUnpEv3bHCJSjsItZlI4vBrXKqqlFkvgGBW/6m7gXh5CwYtnAkMwnXc6KkwYYu9 wZD5alC2TvPMT8iI05AZp5/5E/2Qo+fpTfjHmq1ouXwyCcbgv8+/4zH0ZuhfsVL0PC3O GEIdUJYcO+hpBGV7qLhU0iizbBkQKXL7gsWSTI3iWlhScjbsIdKKO/nw/zfVnxkUcC/6 adqfWUhIBawGwpcamd4EAbwFUvgZLaf8JD+qeXdwkFCrV0puZ+GjihErxwtG7yixkOBg uN0Q== X-Forwarded-Encrypted: i=1; AHgh+RpVcPW0+F9zTIfFTaI83f6X8bO0IlifH7pJccRJ5LSWMMbXaodLlmC/VvE+fCC94Fm/Dqfq30Om5GqZxCY=@vger.kernel.org X-Gm-Message-State: AFuF++nTRILXAXl/l/kXOXNHOW2HpKwJL0LieYrr9x760BYNUsYp3I72 xgj53phyc/5lS1nBsnCZJKOCekwU/VPcpLgjN1/toIzoffP5UbM/DqUp X-Gm-Gg: AR+sD12tnGwpbj5BX1/yXVQi+t85/3P+UNgOFgVyIGQiskudc6Cx8+hWGE/ISoAWISH 7Ntpd11LS+Bneeslmlq8p2ySZla5Fn5cuPByqCjn4wXai54RFcMJ3X/313xUmLdbF6yTZJhoI9F gOmoPfi5onVc15ul/C5a8NrSYiP8n06FZU6sByHZkp6o+JmtgSzDc5agLgZlGFK9UEd6R8w0YJl UmenuAuGjQCOjpLmcQ0nDbMG0l/BVhTSiQpiZcyXNDTISmtnzkACV+hSwuDscYYAKj2b67cPqji fYRvXzvEX2I4JUYEy2nuX1Lt+98MiLjLKbCKY4pC5q3dZ4VocdxeFKurKPREujItBC/fRVB/ySi kdoXysQcbAREvWlfewrdXqC9LeocGv/sRSbV6ThMfYeu9nz845RikN0xvD77bOlT2HMQdi60rT0 7cywMyuBhqlMopE3xtb7611icnYWuQ5COUWbTaYeGQ0P3Qh4NNgBWJjvJF6NHdK6xpDZb5BS4Vj 7N9zOY06wK2KwSSwxwiOmLFjgKvwuz2dW/zliotTaLT3L8kvQbh1Q== X-Received: by 2002:a17:902:f70e:b0:2cf:afa5:b19a with SMTP id d9443c01a7336-2d64afd7c86mr127975675ad.11.1787314758722; Fri, 21 Aug 2026 05:19:18 -0700 (PDT) Received: from deepanshu-Legion-Pro-5-16AFR10.. ([2405:201:682f:383f:569e:7ed4:3735:ea2a]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-327bf1970b0sm27831246eec.29.2026.08.21.05.19.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 21 Aug 2026 05:19:18 -0700 (PDT) From: Deepanshu Kartikey To: heikki.krogerus@linux.intel.com, gregkh@linuxfoundation.org Cc: pooja.katiyar@intel.com, johan@kernel.org, pmenzel@molgen.mpg.de, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Deepanshu Kartikey , syzbot+23cf45a9fce78e4e0dc1@syzkaller.appspotmail.com Subject: [PATCH] usb: typec: ucsi_acpi: fix NULL pointer dereference in ucsi_acpi_probe() Date: Fri, 21 Aug 2026 17:49:09 +0530 Message-ID: <20260821121909.13556-1-kartikey406@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit ucsi_acpi_probe() dereferences the ACPI companion device pointer returned by ACPI_COMPANION() without checking it for NULL. While this driver is normally probed through ACPI device enumeration where a companion is always present, a platform_device can also be manually bound to any platform driver via the sysfs 'bind' file (bind_store() -> bus_find_device() -> driver_attach_device()), which matches purely on device name and bypasses ACPI matching. If ucsi_acpi is bound this way to a platform device with no ACPI companion, ACPI_COMPANION() returns NULL and the subsequent adev->dep_unmet access dereferences a NULL pointer, resulting in a general protection fault. Add a NULL check for adev immediately after it is obtained and before any resource allocation, returning -ENODEV to decline binding cleanly. Reported-by: syzbot+23cf45a9fce78e4e0dc1@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=23cf45a9fce78e4e0dc1 Tested-by: syzbot+23cf45a9fce78e4e0dc1@syzkaller.appspotmail.com Signed-off-by: Deepanshu Kartikey --- drivers/usb/typec/ucsi/ucsi_acpi.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/usb/typec/ucsi/ucsi_acpi.c b/drivers/usb/typec/ucsi/ucsi_acpi.c index 18286d3e9cc5..9fe4ba43afea 100644 --- a/drivers/usb/typec/ucsi/ucsi_acpi.c +++ b/drivers/usb/typec/ucsi/ucsi_acpi.c @@ -196,6 +196,9 @@ static int ucsi_acpi_probe(struct platform_device *pdev) acpi_status status; int ret; + if (!adev) + return -ENODEV; + if (adev->dep_unmet) return -EPROBE_DEFER; -- 2.43.0