From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from m16.mail.163.com (m16.mail.163.com [117.135.210.4]) (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 723EE492E2E for ; Mon, 19 Oct 2026 08:42:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=117.135.210.4 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792399381; cv=none; b=X3br+6c3EDK2OjTGC04fqa2bHc2EG8F+CxSIGpwgmHNB/nZ9Tf5HODhbU8R8K18yxaTFg3t9q8aPbltCT7iIIND/pzbXq06ZEXJZNXHg+b/5MPEXqEAhpynOFssyZF/yFrgwa+NqRKjpNE9mrNG9QzCHAmRLUooeWW3BvI/9JaM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792399381; c=relaxed/simple; bh=/qX7jq3Vxcnbwiop1BkOR0WyYRGmgrCYKG7zxbDnLJs=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=RtDaKJr4x9SXHj6nKOrsO0ckPQE6IR78gqWiJbAormMBR89ax3scFzcJjfw75PALfkc4BdXOZdtPHoDZtoPNw6afvCm9gUjej3T1o6Tzllk9si/3UvZK0to50hK2nepPAdBqzhfSkHeWF1ne5+01efALifYIcKvWKZRr0o9F2d8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=XPOnmQnx; arc=none smtp.client-ip=117.135.210.4 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="XPOnmQnx" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=da 13CFE+ZPvGuNuuZVb+iDMeA1YYGpy3GImvJBlr+po=; b=XPOnmQnxpnevyf6ih8 8SbYpfqSet+Jy6op9GyLzLX8greIkhbIe69R6AtHrEKsemwBBjUvJsPtc0zGKOP9 1ZS+RdJV9Uc1/vPmisrsfxUMWTLF9yuNZHZKZZOQUbzBrU6s4NqCNdfBdotLk4vG UcAQ2eNsF/c6Enzpp3qoJ9mUU= Received: from pc.localdomain (unknown []) by gzga-smtp-mtada-g1-4 (Coremail) with SMTP id _____wDnt9ng19VqcQOlAw--.9091S3; Mon, 19 Oct 2026 16:42:13 +0800 (CST) From: Jiale Yao To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Ben Skeggs , Dave Airlie , =?UTF-8?q?Christian=20K=C3=B6nig?= , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Cc: Jiale Yao Subject: [PATCH 1/6] drm/vram-helper: reject empty VRAM ranges Date: Mon, 19 Oct 2026 16:41:33 +0800 Message-Id: <20261019084138.1821477-2-yaojiale02@163.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20261019084138.1821477-1-yaojiale02@163.com> References: <20261019084138.1821477-1-yaojiale02@163.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID:_____wDnt9ng19VqcQOlAw--.9091S3 X-Coremail-Antispam: 1Uf129KBjvdXoWrKrWUCw4ruF17WrWkGF4kJFb_yoWfWFb_Ga y5XFn3Gr1Dua4qyFn3Aw47ZrySyF1DuF4Fvw45KayfA3srJ3WrXr12g34kW348G3W3AFyD Ca1aqrWSqrnF9jkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7sRiAwI7UUUUU== X-CM-SenderInfo: x1dryxhdohiji6rwjhhfrp/xtbCzgU-eWrV1+UzdwAA3E A VRAM range smaller than a page becomes a zero-page TTM range and causes drm_mm_init() to hit its zero-range BUG check. Reject such ranges before initializing the TTM device. Fixes: 37205891d84f ("drm/ttm: make ttm_range_man_init/takedown take type + args") Signed-off-by: Jiale Yao --- drivers/gpu/drm/drm_gem_vram_helper.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/drm_gem_vram_helper.c b/drivers/gpu/drm/drm_gem_vram_helper.c index bca802ccddee..f8bf2d002236 100644 --- a/drivers/gpu/drm/drm_gem_vram_helper.c +++ b/drivers/gpu/drm/drm_gem_vram_helper.c @@ -851,6 +851,9 @@ static int drm_vram_mm_init(struct drm_vram_mm *vmm, struct drm_device *dev, { int ret; + if (vram_size < PAGE_SIZE) + return -EINVAL; + vmm->vram_base = vram_base; vmm->vram_size = vram_size; -- 2.34.1