From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from m16.mail.163.com (m16.mail.163.com [117.135.210.5]) (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 6BF7549B44D for ; Mon, 19 Oct 2026 08:43:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=117.135.210.5 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792399392; cv=none; b=Yrc6NhuIlUK8NqVluoSRf3gulllt+pywZbeHpammjf3+Hd2EAKJ2N7QgAjjTi/1R2fJgUNBV/Oi+zZZwBVdq5BL3AHvXDLcIQRSXg6jL6USNpofeR7UfB+r4dQHpF2FlgXMmUnEreBPvk2/oPC8jyueG8uDKKpbQnxho16V7E1s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792399392; c=relaxed/simple; bh=NYx71Kn4n5bzl4yCjZZiDc5gAcEOT7IhuRYpjwkXkG4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=WMTJUhwrt1kionYwILJynZwqecvXfyBWeAUHHToRt0y/XsGqKRxhFWDVMTFrvYfq3mee2UiW3JTaVwZHpdRcRI3eKEdCoVkZWljf2TsJvsyHzuvSnmw+gpPgoC2Gx925BIy+W0a03r4PchTRpG6mkAudwmwErJNFCBc8BR49dBA= 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=EQB7szLg; arc=none smtp.client-ip=117.135.210.5 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="EQB7szLg" 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=wi SgM3R8DltnKlDzzq9tlD8y5p7AFM+owbcZ0ZWu3QY=; b=EQB7szLgTbN//+NwUS c8q6q/m/FZn8ajNiWgUXAckWVsse7PYoHse542HImhUTVd+ApBmAetAsooz9dq5Z XJea61dXJ73X4NIrS2db8GbtfLBBHndGKDqYpozzUQ2OAzd6J1j1c7XlE+CNGRcv PDrIrngDu11I9hh7CZpGJvDks= Received: from pc.localdomain (unknown []) by gzga-smtp-mtada-g1-4 (Coremail) with SMTP id _____wDnt9ng19VqcQOlAw--.9091S7; Mon, 19 Oct 2026 16:42:18 +0800 (CST) From: Jiale Yao To: Christian Koenig , Huang Rui , Matthew Auld , Matthew Brost , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , David Rheinsberg , Dave Airlie , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Cc: Jiale Yao Subject: [PATCH 5/6] drm/ttm: reject empty range manager sizes Date: Mon, 19 Oct 2026 16:41:37 +0800 Message-Id: <20261019084138.1821477-6-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--.9091S7 X-Coremail-Antispam: 1Uf129KBjvdXoWruw48Wr4UCw48tw1kuFWkXrb_yoWfXFc_u3 y8Xrn7WrW3G3sxAF1DAw1fZFyaya15uayvvw1Fqasxtr98Z348X3429r97XrykX3W7GF98 uan8tw1rtr13ujkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7sRt5l1tUUUUU== X-CM-SenderInfo: x1dryxhdohiji6rwjhhfrp/xtbC7wpAemrV1+o3BAAA3u A zero page count reaches drm_mm_init() and causes its zero-range BUG check to fire. Return an error before allocating and installing the range manager. Fixes: 77ef8bbc87be ("drm: make drm_mm_init() return void") Signed-off-by: Jiale Yao --- drivers/gpu/drm/ttm/ttm_range_manager.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/ttm/ttm_range_manager.c b/drivers/gpu/drm/ttm/ttm_range_manager.c index b818836f0726..5fd484ae1706 100644 --- a/drivers/gpu/drm/ttm/ttm_range_manager.c +++ b/drivers/gpu/drm/ttm/ttm_range_manager.c @@ -184,6 +184,9 @@ int ttm_range_man_init_nocheck(struct ttm_device *bdev, struct ttm_resource_manager *man; struct ttm_range_manager *rman; + if (!p_size) + return -EINVAL; + rman = kzalloc_obj(*rman); if (!rman) return -ENOMEM; -- 2.34.1