linux-kernel - [PATCH] [23/106] b43: allocate receive buffers big enough for max frame len + offset

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Date:	Tue, 26 Apr 2011 14:13:01 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	linville@...driver.com, Larry.Finger@...inger.net, gregkh@...e.de,
	ak@...ux.intel.com, linux-kernel@...r.kernel.org,
	stable@...nel.org, tim.bird@...sony.com
Subject: [PATCH] [23/106] b43: allocate receive buffers big enough for max frame len + offset

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: John W. Linville <linville@...driver.com>

commit c85ce65ecac078ab1a1835c87c4a6319cf74660a upstream.

Otherwise, skb_put inside of dma_rx can fail...

	https://bugzilla.kernel.org/show_bug.cgi?id=32042

Signed-off-by: John W. Linville <linville@...driver.com>
Acked-by: Larry Finger <Larry.Finger@...inger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 drivers/net/wireless/b43/dma.c |    2 +-
 drivers/net/wireless/b43/dma.h |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

Index: linux-2.6.35.y/drivers/net/wireless/b43/dma.c
===================================================================
--- linux-2.6.35.y.orig/drivers/net/wireless/b43/dma.c
+++ linux-2.6.35.y/drivers/net/wireless/b43/dma.c
@@ -1538,7 +1538,7 @@ static void dma_rx(struct b43_dmaring *r
 		dmaaddr = meta->dmaaddr;
 		goto drop_recycle_buffer;
 	}
-	if (unlikely(len > ring->rx_buffersize)) {
+	if (unlikely(len + ring->frameoffset > ring->rx_buffersize)) {
 		/* The data did not fit into one descriptor buffer
 		 * and is split over multiple buffers.
 		 * This should never happen, as we try to allocate buffers
Index: linux-2.6.35.y/drivers/net/wireless/b43/dma.h
===================================================================
--- linux-2.6.35.y.orig/drivers/net/wireless/b43/dma.h
+++ linux-2.6.35.y/drivers/net/wireless/b43/dma.h
@@ -163,7 +163,7 @@ struct b43_dmadesc_generic {
 /* DMA engine tuning knobs */
 #define B43_TXRING_SLOTS		256
 #define B43_RXRING_SLOTS		64
-#define B43_DMA0_RX_BUFFERSIZE		IEEE80211_MAX_FRAME_LEN
+#define B43_DMA0_RX_BUFFERSIZE		(B43_DMA0_RX_FRAMEOFFSET + IEEE80211_MAX_FRAME_LEN)
 
 /* Pointer poison */
 #define B43_DMA_PTR_POISON		((void *)ERR_PTR(-ENOMEM))
--
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