From: Michael Buesch <mb@bu3sch.de>
To: "Linville, John" <linville@tuxdriver.com>
Cc: bcm43xx-dev@lists.berlios.de, Steve Brown <sbrown@ewol.com>,
netdev@vger.kernel.org
Subject: [PATCH] bcm43xx-d80211: Fix DMA TX skb doublefree
Date: Thu, 21 Dec 2006 19:16:50 +0100 [thread overview]
Message-ID: <200612211916.51150.mb@bu3sch.de> (raw)
This fixes a possible double-free of the TX skb buffers.
Always NULL the pointer after freeing.
Signed-off-by: Michael Buesch <mb@bu3sch.de>
Index: wireless-dev/drivers/net/wireless/d80211/bcm43xx/bcm43xx_dma.c
===================================================================
--- wireless-dev.orig/drivers/net/wireless/d80211/bcm43xx/bcm43xx_dma.c 2006-12-07 17:25:19.000000000 +0100
+++ wireless-dev/drivers/net/wireless/d80211/bcm43xx/bcm43xx_dma.c 2006-12-21 19:05:28.000000000 +0100
@@ -388,6 +388,7 @@ void free_descriptor_buffer(struct bcm43
dev_kfree_skb_irq(meta->skb);
else
dev_kfree_skb(meta->skb);
+ meta->skb = NULL;
}
}
@@ -1131,6 +1132,7 @@ void bcm43xx_dma_handle_txstatus(struct
meta->txstat.retry_count = status->frame_count - 1;
ieee80211_tx_status_irqsafe(bcm->ieee, meta->skb, &(meta->txstat));
/* skb is freed by ieee80211_tx_status_irqsafe() */
+ meta->skb = NULL;
} else {
/* No need to call free_descriptor_buffer here, as
* this is only the txhdr, which is not allocated.
--
Greetings Michael.
reply other threads:[~2006-12-21 18:23 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
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