From nobody Sat Feb 7 21:08:12 2026 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.17]) (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 6042A2620E5; Fri, 30 Jan 2026 05:26:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.17 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769750763; cv=none; b=b+/mBmf9UpjfaAGTTnCwH9y2SxE7S+12VYsOJHzrskH9fpCz3//5fQG7e7SFJr5d2eqc9Ff5tpq6JDnr5RYapZc/z9zgeZw/TZmadVxOnfmu/TgK0EMHZxaqRyTopTKdGYijuSTXCaGTZVmS1i+fNV4pGZ/bxjwcJPdAp/vlLTo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769750763; c=relaxed/simple; bh=yQtrIZYMGBOPGh7ijILbyFvEjfTD1GYQwagRe1+arKg=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=JjEcGOsFnsmmwQddVAsVo8w0NOy+j8QiyNEonhLuob/BMQGJzPOHLJX+cGroPG7ltFEYzIgPc+DXfT5V+DZ31YKCTLq7MGt2xPta0mzizoHwOBsu+naemFdgRKOZTyuyGzPKv1e5zPm3ld/mwigEvxvzc6enzgaUp8thWjzSVyo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=khzVCdJH; arc=none smtp.client-ip=198.175.65.17 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="khzVCdJH" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1769750762; x=1801286762; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=yQtrIZYMGBOPGh7ijILbyFvEjfTD1GYQwagRe1+arKg=; b=khzVCdJH32SWvGZBckmDx6YP4LIdqv3Lo1PhpYKcpKGNR2SdmCNdX9d5 hq7Yz3A7Y94qJBtpPr0DAtFDv7RaKZ46n2hEA5Yzqzl8z9vf+cG4Ju+Po iWJ2szhMjJew5NmHzphnLEXzcelYrVcJCP7EHXeB5ClemOS++OYtKKJCW tgnLWVwVW2jEIBIftsW8Mf8d7sPSM3tOYQuzwvRG+Dc+7jiPYcUjkUR1l QPMfTGv/kZJ4ivRlG1YgEavhuCPNX7QGRHs4uVuR1HdE3zrawlpxjplHa 7c68mcU/GnDkNLGwdHv5lZEDguJzPg1D4Xj4XYejZS2rYyoAoecG47eKx Q==; X-CSE-ConnectionGUID: InAJN7/fTXyrTZ1CvcVvjw== X-CSE-MsgGUID: CwZlQsJQQ92QhBL+EjQ2uw== X-IronPort-AV: E=McAfee;i="6800,10657,11686"; a="70977454" X-IronPort-AV: E=Sophos;i="6.21,262,1763452800"; d="scan'208";a="70977454" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by orvoesa109.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Jan 2026 21:26:01 -0800 X-CSE-ConnectionGUID: LsRhM8w+QTWksDvbxbZ68g== X-CSE-MsgGUID: NKClVpYnRUSEA2pql2K0EQ== X-ExtLoop1: 1 Received: from linryan-mobl2.gar.corp.intel.com (HELO linryan-mobl2.intel.com) ([10.246.105.132]) by fmviesa003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Jan 2026 21:25:57 -0800 From: Ryan Lin To: linux-kernel@vger.kernel.org, linux-input@vger.kernel.org, linux-drivers-review@eclists.intel.com, srinivas.pandruvada@linux.intel.com, lixu.zhang@intel.com Cc: Ryan Lin Subject: [PATCH] HID: intel-ish-hid: fix NULL-ptr-deref in ishtp_bus_remove_all_clients Date: Fri, 30 Jan 2026 13:25:44 +0800 Message-Id: <20260130052544.4784-1-ryan.lin@intel.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" During a warm reset flow, the cl->device pointer may be NULL if the reset occurs while clients are still being enumerated. Accessing cl->device->reference_count without a NULL check leads to a kernel panic. This issue was identified during multi-unit warm reboot stress clycles. Add a defensive NULL check for cl->device to ensure stability under such intensive testing conditions. KASAN: null-ptr-deref in range [0000000000000000-0000000000000007] Workqueue: ish_fw_update_wq fw_reset_work_fn Call Trace: ishtp_bus_remove_all_clients+0xbe/0x130 [intel_ishtp] ishtp_reset_handler+0x85/0x1a0 [intel_ishtp] fw_reset_work_fn+0x8a/0xc0 [intel_ish_ipc] Fixes: 3703f53b99e4a ("HID: intel_ish-hid: ISH Transport layer") Signed-off-by: Ryan Lin --- drivers/hid/intel-ish-hid/ishtp/bus.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/hid/intel-ish-hid/ishtp/bus.c b/drivers/hid/intel-ish-= hid/ishtp/bus.c index c3915f3a060e..b890fbf97a75 100644 --- a/drivers/hid/intel-ish-hid/ishtp/bus.c +++ b/drivers/hid/intel-ish-hid/ishtp/bus.c @@ -730,7 +730,7 @@ void ishtp_bus_remove_all_clients(struct ishtp_device *= ishtp_dev, spin_lock_irqsave(&ishtp_dev->cl_list_lock, flags); list_for_each_entry(cl, &ishtp_dev->cl_list, link) { cl->state =3D ISHTP_CL_DISCONNECTED; - if (warm_reset && cl->device->reference_count) + if (warm_reset && cl->device && cl->device->reference_count) continue; =20 /* --=20 2.34.1