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 DF17F33D505 for ; Sat, 12 Sep 2026 15:33:42 +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=1789227224; cv=none; b=TkZGym/nLIWc8dyXSEVTnCjiEZPfn7we3vQETGkyQ0DDTkTsRtCxEdZG7IbGs6a5HUDQZOeNjr5qt9dBXIb7ErWxiB5qb0sST1jfgkuM6pvcJTV5IASC9AO4KogQrmdvjcsrsJSY2V49IlZDdTY6ORWYPSfOnjWyrdmvtYhsC2c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789227224; c=relaxed/simple; bh=1xsN4pELrtjyl1qeOwoiLcMy9rhg7HOkHL24s0OlEBw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=H4sMUKiSuKiWjDcEGTS4I75h8BqdPdnwEAymMhfS1rU4PPsHccL5f0rp7qJoZpyPXYBUlQB5YojcIwcLWYitGUopkHycTkFJCAo4HF2wWerFz01CsfNBa+d7jsC76Bhh7VEsIYIsKgYvUyjrDSPbi27pAiKgefoKh8Vt628qUKA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=NUKCxekj; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="NUKCxekj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 22E4E1F00898; Sat, 12 Sep 2026 15:33:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789227222; bh=d1hYkJEWy/Y5PWwvwR+Ge9vDOcgx7nsi39bNSuAzm6E=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=NUKCxekjXS/sar9H86EUOVe8SnofmlzgUvIjQyXF46LJBpEL9RThVo3f5XSlv49J5 sEFJwSrQQ1AW1zKhbes44NSL+T9tzuzjC1JffaU9JG+z5OwBmjX7rNk7EPQxMVT64l TdlTKXJp1Z/3GuufVn85uzSEJWZ1rhWgsnPtjwU3uoJUcCOanUpP1Zb+vgkJfYBdER 0R0j61QaBkrNHrN1cV+tP5jsWvU1SMV+l90nojpxxKWD1njIzilYGIx437suUX/o08 O3MxBZRX8+SlF+/W7BCp+RXG6Zh/ZDLMxW8nksN2r4/ATTA17wpFubiioZlRdKv9Hq Q2rGbjHedqp5g== From: Sasha Levin To: stable@vger.kernel.org Cc: Thomas Zimmermann , Thierry Reding , Maxime Ripard , Javier Martinez Canillas , Sasha Levin Subject: [PATCH 6.12.y 2/2] drm/sysfb: simpledrm: Improve framebuffer-size validation Date: Sat, 12 Sep 2026 11:33:39 -0400 Message-ID: <20260912153339.3234260-2-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260912153339.3234260-1-sashal@kernel.org> References: <2026090919-operation-hull-a6ea@gregkh> <20260912153339.3234260-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Thomas Zimmermann [ Upstream commit 03f1a3545b721fa7fdadd00080e237519a286a97 ] Validate the framebuffer size from the firmware against the limitations of struct drm_display_mode. The type only stores sizes in 16-bit fields. Fail probing on errors. v2: - remove unused function simplefb_get_validated_int0() (Sashiko) Signed-off-by: Thomas Zimmermann Reviewed-by: Thierry Reding Reviewed-by: Maxime Ripard Reviewed-by: Javier Martinez Canillas Fixes: 11e8f5fd223b ("drm: Add simpledrm driver") Cc: # v5.14+ Fixes: 11e8f5fd223b ("drm: Add simpledrm driver") Link: https://patch.msgid.link/20260625094509.157581-2-tzimmermann@suse.de [ adapted shared-validator changes to the existing simplefb_get_validated_int0() helper in drm/tiny/simpledrm.c. ] Signed-off-by: Sasha Levin --- drivers/gpu/drm/tiny/simpledrm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/tiny/simpledrm.c b/drivers/gpu/drm/tiny/simpledrm.c index 07abaf27315f7..b5df36aea6575 100644 --- a/drivers/gpu/drm/tiny/simpledrm.c +++ b/drivers/gpu/drm/tiny/simpledrm.c @@ -54,7 +54,7 @@ static int simplefb_get_validated_int0(struct drm_device *dev, const char *name, uint32_t value) { - if (!value) { + if (!value || value > U16_MAX) { drm_err(dev, "simplefb: invalid framebuffer %s of %u\n", name, value); return -EINVAL; -- 2.53.0