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 1767013777E; Tue, 16 Jun 2026 16:31:09 +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=1781627471; cv=none; b=cfJo/Ymx0+lY0/YDUz5Ibnw1XwhwXWnLpO+qtuyEh2ir7hWgQ/K5k6Kgq/MZH/CvAzRc0bMSoleru0DRa86KWN/DnhUt94YrA7RZnnXasw0F1P9TBSlZl8t3AlsdIG3qKixDcrHLFzI3WTU35C3ra3W9GBD5YSXPD6B8bb5IyWw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781627471; c=relaxed/simple; bh=O9hxNoyBL02BkO+eNqfp56/J2KPnMZO8PPCJl4fflyY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=DZlzO36ixQQ7KcvaHV5c/iV9meKElRMHw6I9Nv6DYf8Xuli5wS69HyqspmOm5g1pbREZ1fSFGRHF1vJ7DgbETEFT7LWD0sc2+i2BFcyUJiDuIJLm7LQ+ZVa67tzXCjydtaFiHN08m8B4PGsxHAF7aj/hS7ZthHvUhYd2tELoAm0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=uh7j7snZ; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="uh7j7snZ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B1DC81F000E9; Tue, 16 Jun 2026 16:31:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1781627469; bh=clVPpttSFDZtwDgTfdmmohNS/zVHuymzxMaTvCjgrZo=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=uh7j7snZPl/8LQOmwwTEaL+bDFAIfxRPi3h7/tKAjJTwYRKbjkIVbqZXDQeHKNI8X uAFzaIagfSLQglYtxU4swdpnh11ORn/1t41IbsXpfrsop2/5jp/cVvfyESUs/hc9lA pMWT08W1AW0WrVibdaVKq6/Mrn/YvL6SezYo0mDQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Wentao Liang , Dmitry Osipenko Subject: [PATCH 6.12 146/261] drm/virtio: fix dma_fence refcount leak on error in virtio_gpu_dma_fence_wait() Date: Tue, 16 Jun 2026 20:29:44 +0530 Message-ID: <20260616145051.846268508@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260616145044.869532709@linuxfoundation.org> References: <20260616145044.869532709@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Wentao Liang commit 3f26bb732cc136ab20176697c92f32c9c84cb125 upstream. dma_fence_unwrap_for_each() internally calls dma_fence_unwrap_first() which does cursor->chain = dma_fence_get(head), taking an extra reference. On normal loop completion, dma_fence_unwrap_next() releases this via dma_fence_chain_walk() -> dma_fence_put(). When virtio_gpu_do_fence_wait() fails and the function returns early from inside the loop, the cursor->chain reference is never released. This is the only caller in the entire kernel that does an early return inside dma_fence_unwrap_for_each. Add dma_fence_put(itr.chain) before the early return. Cc: stable@vger.kernel.org Fixes: eba57fb5498f ("drm/virtio: Wait for each dma-fence of in-fence array individually") Signed-off-by: Wentao Liang Reviewed-by: Dmitry Osipenko Signed-off-by: Dmitry Osipenko Link: https://patch.msgid.link/20260607090303.92423-1-vulab@iscas.ac.cn Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/virtio/virtgpu_submit.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/drivers/gpu/drm/virtio/virtgpu_submit.c +++ b/drivers/gpu/drm/virtio/virtgpu_submit.c @@ -65,8 +65,10 @@ static int virtio_gpu_dma_fence_wait(str dma_fence_unwrap_for_each(f, &itr, fence) { err = virtio_gpu_do_fence_wait(submit, f); - if (err) + if (err) { + dma_fence_put(itr.chain); return err; + } } return 0;