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 B4E2D2FDC30 for ; Sat, 12 Sep 2026 15:39:55 +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=1789227596; cv=none; b=LiAwBL6ngYHd7clYo3IGAm8Svw3XadJC3vWyGniDzCc2BSPI9Ce97waD/QcC6PauOhNev2RZiFYSL9YWOe5SXaIXo8X0XSaF45OF3i2A71MRo3FAdeWn7TJ2jvGwuukl7ujFHVHg2ks073G4eukb+1k6k0Ubw/XfJQIhGBlYx1o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789227596; c=relaxed/simple; bh=c2u+Loqsb0Z8bYd20BzCpOOADV7yUAEx1S115q5f8fI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=izy3HDBBBMKccdXCcoaKZBtbuC6V2fVXP1W+9IiQQ+qQd+fA174FkoIbS3Zajv1/t8CJ8pY1u2gaeqfInT2Kj2GFgvqJM2MvUU5EQ4c8q4+yppYXPQQli5VrJk/SyJoQ0X8nuJJ/oa5mp1Md9aL/I3Lr2fB2LZ3yW16woP0DdUk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=SePqfZGO; 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="SePqfZGO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D85D81F000FF; Sat, 12 Sep 2026 15:39:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789227595; bh=5uigI5C2u4bezsqF4b0vqLpI4yvD7SiU0fTFOulJVxk=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=SePqfZGOer2n5+eI6MRSE+I0RPgn2ulTwjKGY1kI7KfhoWe/AIxgKTGSovivSuZTc dmnRd9jEx2lqu19HEX5U3EqVHHkTyzVsjcFSV/ozo4KqNKJC8iv2KtM6PJ6F6oEQmt oSBqN2o19k+iR68OFZmoBtsHa2243/6lAGebv/wvfMBxai90OPnH59UYrFjLOGTKTH 1toSuQ2hxUIT8ioBzOEyY0pUmWcxJ/BE7arI42B0ttXTI5h3J9gn0AuIXlFHjKXzdJ YpuZtZOXksuwtSR4Chos5xqOrwobXBszRn9U+4TjFi1AKgW5aVp5qlrCQNUceutLz0 Hzp0JNZfv4GsA== From: Sasha Levin To: stable@vger.kernel.org Cc: Thomas Zimmermann , Thierry Reding , Maxime Ripard , Javier Martinez Canillas , Sasha Levin Subject: [PATCH 6.6.y 2/2] drm/sysfb: simpledrm: Improve framebuffer-size validation Date: Sat, 12 Sep 2026 11:39:52 -0400 Message-ID: <20260912153952.3238327-2-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260912153952.3238327-1-sashal@kernel.org> References: <2026090919-cross-finalize-0ac3@gregkh> <20260912153952.3238327-1-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 30676b1073034..fa40da758213c 100644 --- a/drivers/gpu/drm/tiny/simpledrm.c +++ b/drivers/gpu/drm/tiny/simpledrm.c @@ -52,7 +52,7 @@ 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