From nobody Sat Feb 7 21:08:13 2026 Received: from mail-pl1-f173.google.com (mail-pl1-f173.google.com [209.85.214.173]) (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 AD3EC32D7F3 for ; Thu, 18 Dec 2025 12:10:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.173 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766059815; cv=none; b=MVuNiNvtWkXEh2FV1s4LPnsG1UkveWdMB42YFYaGjwvWDBZv0oaSay1hLusk+GYghaBsI/8J5CaLUDPrKrzE8cTVuvk2Uqc15IY1uBgYkbA+J73uTrlWpWUQXP5CIiVv2bZUJprFPFPVIKto0S9pEu8ARNhdPwWfmCn19H6bnek= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766059815; c=relaxed/simple; bh=mqizUohXODIUgHjUGOfUeeFrKgt+EoyBTY8+QLnnaZo=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=a55Ls+JrNjNQAeI76FkCc3TtR3De3AtRKH3FtC7mGSWFewgYIqhF5ZWIs/vXwJ+lTFJUI8vzs62Ps+ajHDEFzVJvodwkmZ0h+3r6NCrlNijVXbZr8fez6V0Eyp5bCmB9t5MukGPjo+9jnMoM2BMXZ4hjR+oETopDDMXOSGJm0wE= 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=CSfEfx8D; arc=none smtp.client-ip=209.85.214.173 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="CSfEfx8D" Received: by mail-pl1-f173.google.com with SMTP id d9443c01a7336-2a0a33d0585so5227615ad.1 for ; Thu, 18 Dec 2025 04:10:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1766059813; x=1766664613; 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; bh=qOWaFXqpm74y7sdJY7lj3lPz4pEHcCsnHUa4ddlZBMY=; b=CSfEfx8DKv/nzuHgnislGSpnnQvPrpOAHV7t9EY14aPNI/RF9U+tZzerzIHhFUX6PC o5w5dMkQdELx9cM90pkU+lr6cs9jNkc73g/Ar4qnZ/6UEBtxVzWP8VSVFR7QX0WAcUEl AgwlZSradEVMR4qi97Gr/LT9m8Oz7K7NqPt7rEE62MSZ0M6n5lc19jC+I3YpZmCriDN5 sdXY6MrXyc48peFePJv9E6M27kekqr5oTFp9jbKuGFayqGLcbCg96+0Ke0q3FE3ZlsiG WCypSjHV79mJqN4QazR3Mku0tGzbed2rcYmvOK/aVg92F4MoDVqMjU6nBoEQrbAMtrWB qtNw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1766059813; x=1766664613; 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; bh=qOWaFXqpm74y7sdJY7lj3lPz4pEHcCsnHUa4ddlZBMY=; b=lzF1dtfaWc3hMlCexeEkx1pUpcnknrar1/wziMeDfhU7IFomUGsIvNwYRKPg8YTFjn Fg97lSiu9lzbw08eaE41i44LYhrDr3GeIGkqN6fPuTB3yE8m/eBavT1RWCW0bFnknP43 3BNKuOPBu94K0TstzuuTnBeG/cyg9JezWhpSaIbbObJ9ccY2GdZhP6XoJnbOKzPLL9qt 7/T+tMxfCgirBaJEzxN+t+gvnxhAuhhZih1UP5fkVFQfyJQxB6zIy6DNMmQbWox/F4zL WAbIvY3IATihOd8RwUC/nrp3Csk07yJ+df0e6VajuKwJ4OOHvcRQ2Btf4W/EZyZxoqhZ LQnA== X-Forwarded-Encrypted: i=1; AJvYcCXBl0SfDNB9k7FHLYwTW8lA4Iy5K7Oo0fBa8z0EFd2VCw9C9Zab4vSGkLRktnjtecmsHKB1yYLicb4i76M=@vger.kernel.org X-Gm-Message-State: AOJu0YyTc53unHdeG57gJ2UWxDHxQwIMLmmKq1hUyXRZhXC7EHBO2pNn Mdtgrq+bOYvIuzDgNDcGcadadKBADT4b1MWRZEFAJESic4qz+weh32cw X-Gm-Gg: AY/fxX7erjHi5JASmm5RQ1CnH6+zhMSzId8ca8qSigFz4bn2MQVjBx78UCH0LgHikij 1Vz6sOaK4+8OpNt1Zft+EGTUfkIsfsw+m5C/BMrFIABAUH2Flld4qt+TZ95WAURAWYuPLUZOK4x DZHVBN00+egQ7nhWeSGDNb4L7W5jqOuzufT49fLNZUeHoP6MqHy+pttsvh0ked+OVakfwcLCtqd nTwIuG0tOhJJKzymvfN9Ypsr2xBWiQWmX9MfjamovcF2QMVNbN0e/acAJAOhokAfWhtQdDM7Pf9 qjbXGXNOoimtoVUFDpGZGUdO5SZPSAspkYttgfYCDb/q7b2LUOhbUbiutUHPNWrbGsWyeSspgUX oOL2C6ajgEd1vMA0YUi9clSXeekao495ZRpwS23T0mpDgnRs4D557awqO7hS/j81nSZCTdno2yI b2XFfn66ZDrG0rg6HhRH8s0JhMe4ZO3lDXgMavLgKvvDlN+Vnmn0d/iSUHhZzBFHlDgBO8AlxJ8 Xm3daBz4QUYfw== X-Google-Smtp-Source: AGHT+IFwS6OIsDwZer+0tNaVZWDLxetbvduNSu7zZktJBqOYGOtNbaVUJPhCqOoTtBYrJt56YuRJyg== X-Received: by 2002:a17:902:e804:b0:295:96bc:868c with SMTP id d9443c01a7336-29f23dd535dmr215259295ad.5.1766059812744; Thu, 18 Dec 2025 04:10:12 -0800 (PST) Received: from oslab.mshome.net (n058152119183.netvigator.com. [58.152.119.183]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2a2d0888fbdsm24480035ad.32.2025.12.18.04.10.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 18 Dec 2025 04:10:12 -0800 (PST) From: Tuo Li To: neil.armstrong@linaro.org, jesszhan0024@gmail.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, airlied@gmail.com, simona@ffwll.ch Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Tuo Li Subject: [PATCH] drm/panel: Fix a possible null-pointer dereference in jdi_panel_dsi_remove() Date: Thu, 18 Dec 2025 20:09:55 +0800 Message-ID: <20251218120955.11185-1-islituo@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: quoted-printable Content-Type: text/plain; charset="utf-8" In jdi_panel_dsi_remove(), jdi is explicitly checked, indicating that it may be NULL: if (!jdi) mipi_dsi_detach(dsi); However, when jdi is NULL, the function does not return and continues by calling jdi_panel_disable(): err =3D jdi_panel_disable(&jdi->base); Inside jdi_panel_disable(), jdi is dereferenced unconditionally, which can lead to a NULL-pointer dereference: struct jdi_panel *jdi =3D to_panel_jdi(panel); backlight_disable(jdi->backlight); To prevent such a potential NULL-pointer dereference, return early from jdi_panel_dsi_remove() when jdi is NULL. Signed-off-by: Tuo Li Reviewed-by: Neil Armstrong --- drivers/gpu/drm/panel/panel-jdi-lpm102a188a.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/panel/panel-jdi-lpm102a188a.c b/drivers/gpu/dr= m/panel/panel-jdi-lpm102a188a.c index 23462065d726..ea975170faff 100644 --- a/drivers/gpu/drm/panel/panel-jdi-lpm102a188a.c +++ b/drivers/gpu/drm/panel/panel-jdi-lpm102a188a.c @@ -434,8 +434,10 @@ static void jdi_panel_dsi_remove(struct mipi_dsi_devic= e *dsi) int err; =20 /* only detach from host for the DSI-LINK2 interface */ - if (!jdi) + if (!jdi) { mipi_dsi_detach(dsi); + return; + } =20 err =3D jdi_panel_disable(&jdi->base); if (err < 0) --=20 2.43.0