Return-path: Received: from mail-pa0-f45.google.com ([209.85.220.45]:33272 "EHLO mail-pa0-f45.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750947AbbLBFad (ORCPT ); Wed, 2 Dec 2015 00:30:33 -0500 Received: by pabfh17 with SMTP id fh17so30267843pab.0 for ; Tue, 01 Dec 2015 21:30:33 -0800 (PST) From: Fengwei Yin To: linux-wireless@vger.kernel.org, wcn36xx@lists.infradead.org, me@bobcopeland.com, k.eugene.e@gmail.com, bjorn.andersson@sonymobile.com Cc: lking@qti.qualcomm.com, fengwei.yin@linaro.org Subject: [PATCH] wcn36xx: handle rx skb allocation failure to avoid system crash Date: Wed, 2 Dec 2015 13:27:31 +0800 Message-Id: <1449034051-12536-1-git-send-email-fengwei.yin@linaro.org> (sfid-20151202_063037_119357_AA7EB8FF) Sender: linux-wireless-owner@vger.kernel.org List-ID: Lawrence reported that git clone could make system crash on a Qualcomm ARM soc based device (DragonBoard, 1G memory without swap) running 64bit Debian. It's turned out the crash is related with rx skb allocation failure. git could consume more than 600MB anonymous memory. And system is in extremely memory shortage case. But driver didn't handle the rx allocation failure case. This patch doesn't submit skb to upper layer if rx skb allocation fails. Instead, it reuse the old skb for rx DMA again. It's more like drop the packets if system is in memory shortage case. With this change, git clone is OOMed instead of system crash. Reported-by: King, Lawrence Signed-off-by: Fengwei Yin --- drivers/net/wireless/ath/wcn36xx/dxe.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/drivers/net/wireless/ath/wcn36xx/dxe.c b/drivers/net/wireless/ath/wcn36xx/dxe.c index f8dfa05..8887c0f 100644 --- a/drivers/net/wireless/ath/wcn36xx/dxe.c +++ b/drivers/net/wireless/ath/wcn36xx/dxe.c @@ -474,11 +474,20 @@ static int wcn36xx_rx_handle_packets(struct wcn36xx *wcn, struct wcn36xx_dxe_desc *dxe = ctl->desc; dma_addr_t dma_addr; struct sk_buff *skb; + int ret = 0; while (!(dxe->ctrl & WCN36XX_DXE_CTRL_VALID_MASK)) { skb = ctl->skb; dma_addr = dxe->dst_addr_l; - wcn36xx_dxe_fill_skb(wcn->dev, ctl); + ret = wcn36xx_dxe_fill_skb(wcn->dev, ctl); + if (0 == ret) { + /* new skb allocation ok. Use the new one and queue + * the old one to network system. + */ + dma_unmap_single(wcn->dev, dma_addr, WCN36XX_PKT_SIZE, + DMA_FROM_DEVICE); + wcn36xx_rx_skb(wcn, skb); + } switch (ch->ch_type) { case WCN36XX_DXE_CH_RX_L: @@ -495,9 +504,6 @@ static int wcn36xx_rx_handle_packets(struct wcn36xx *wcn, wcn36xx_warn("Unknown channel\n"); } - dma_unmap_single(wcn->dev, dma_addr, WCN36XX_PKT_SIZE, - DMA_FROM_DEVICE); - wcn36xx_rx_skb(wcn, skb); ctl = ctl->next; dxe = ctl->desc; } -- 2.1.4