linux-kernel - [PATCH 3.10 244/319] brcmsmac: Free packet if dma_mapping_error() fails in dma

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Date:   Sun,  5 Feb 2017 20:21:06 +0100
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Kalle Valo <kvalo@...eaurora.org>, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 244/319] brcmsmac: Free packet if dma_mapping_error() fails in dma_rxfill

From: Florian Fainelli <f.fainelli@...il.com>

commit 5c5fa1f464ac954982df1d96b9f9a5103d21aedd upstream.

In case dma_mapping_error() returns an error in dma_rxfill, we would be
leaking a packet that we allocated with brcmu_pkt_buf_get_skb().

Reported-by: coverity (CID 1081819)
Fixes: 67d0cf50bd32 ("brcmsmac: Fix WARNING caused by lack of calls to dma_mapping_error()")
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
Acked-by: Arend van Spriel <arend@...adcom.com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/net/wireless/brcm80211/brcmsmac/dma.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/brcm80211/brcmsmac/dma.c b/drivers/net/wireless/brcm80211/brcmsmac/dma.c
index 4fb9635..7660b52 100644
--- a/drivers/net/wireless/brcm80211/brcmsmac/dma.c
+++ b/drivers/net/wireless/brcm80211/brcmsmac/dma.c
@@ -1079,8 +1079,10 @@ bool dma_rxfill(struct dma_pub *pub)
 
 		pa = dma_map_single(di->dmadev, p->data, di->rxbufsize,
 				    DMA_FROM_DEVICE);
-		if (dma_mapping_error(di->dmadev, pa))
+		if (dma_mapping_error(di->dmadev, pa)) {
+			brcmu_pkt_buf_free_skb(p);
 			return false;
+		}
 
 		/* save the free packet pointer */
 		di->rxp[rxout] = p;
-- 
2.8.0.rc2.1.gbe9624a