From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 4A4053375C5; Mon, 20 Apr 2026 16:08:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776701312; cv=none; b=pLyI/7wdjDcP+b/HYHm/4mr1KMMISghsfA3CrYMWgI2axVIUFn8YkZmWJ2hnLEyo0AoS1vG/gpotYN7eaRkeDBBNJz32TJqY7/evuCuaFlUpns5694FZa7kSzi8LWq6ORizYvPxPc3EUaepsGMzNxhM17DppdFalXqEOD7nkVZs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776701312; c=relaxed/simple; bh=qsoWE3we/b03OvBjcAIzUWwupf4SF/xg6Ny6AT1hu2c=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=ZD4B85DC7ti+igMCbvBggjKKvd1thqI6lRkw4WqakUKX8dORpON6PPYChxhS2wLH2YbqOBsR9NKdoEV5WuBFgg5WHv/KKHvzi87R4xdiGOzogqeb23HXX5Lfzq94lMojuriJWjNTODG26v1aG3dqRdg72Fj+XrRsd0lnh3KdDqI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=HCthERnl; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="HCthERnl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D2D18C19425; Mon, 20 Apr 2026 16:08:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1776701312; bh=qsoWE3we/b03OvBjcAIzUWwupf4SF/xg6Ny6AT1hu2c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HCthERnlsABVazTKtrnkZ6tON0RpE3ctZgXuygJ5uQbY9JZ9DPrmwbENjMZ11Oln8 NToavnF48qCJ4Jxp1T/cdC4nF+jF6QzXynUVCTWsmwtr9Jw0QqE4aQuY3xKkNHcZlQ BZCBDUfGFlLrybifyXzNr+3Zud0/X3MX8hlq21xs= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Melissa Wen , =?UTF-8?q?Ma=C3=ADra=20Canal?= , Sasha Levin Subject: [PATCH 6.12 047/162] drm/vc4: Protect madv read in vc4_gem_object_mmap() with madv_lock Date: Mon, 20 Apr 2026 17:41:19 +0200 Message-ID: <20260420153928.730801483@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260420153927.006696811@linuxfoundation.org> References: <20260420153927.006696811@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Maíra Canal [ Upstream commit 338c56050d8e892604da97f67bfa8cc4015a955f ] The mmap callback reads bo->madv without holding madv_lock, racing with concurrent DRM_IOCTL_VC4_GEM_MADVISE calls that modify the field under the same lock. Add the missing locking to prevent the data race. Fixes: b9f19259b84d ("drm/vc4: Add the DRM_IOCTL_VC4_GEM_MADVISE ioctl") Reviewed-by: Melissa Wen Link: https://patch.msgid.link/20260330-vc4-misc-fixes-v1-4-92defc940a29@igalia.com Signed-off-by: Maíra Canal Signed-off-by: Sasha Levin --- drivers/gpu/drm/vc4/vc4_bo.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/vc4/vc4_bo.c b/drivers/gpu/drm/vc4/vc4_bo.c index 2a85d08b19852..3740e0552960d 100644 --- a/drivers/gpu/drm/vc4/vc4_bo.c +++ b/drivers/gpu/drm/vc4/vc4_bo.c @@ -738,12 +738,15 @@ static int vc4_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct return -EINVAL; } + mutex_lock(&bo->madv_lock); if (bo->madv != VC4_MADV_WILLNEED) { DRM_DEBUG("mmapping of %s BO not allowed\n", bo->madv == VC4_MADV_DONTNEED ? "purgeable" : "purged"); + mutex_unlock(&bo->madv_lock); return -EINVAL; } + mutex_unlock(&bo->madv_lock); return drm_gem_dma_mmap(&bo->base, vma); } -- 2.53.0