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mac80211: fix A-MSDU packet handling with TCP retransmission

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Improves local TCP throughput and fixes use-after-free bugs that could lead
to crashes.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2018-10-11 18:48:35 +02:00
parent 70cb2d20c9
commit 4fa4b5edaf
1 changed files with 31 additions and 0 deletions
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31
package/kernel/mac80211/patches/396-mac80211-free-skb-fraglist-before-freeing-the-skb.patch Normal file
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@ -0,0 +1,31 @@
From: Sara Sharon <sara.sharon@intel.com>
Date: Thu, 11 Oct 2018 14:21:21 +0200
Subject: [PATCH] mac80211: free skb fraglist before freeing the skb
mac80211 uses the frag list to build AMSDU. When freeing
the skb, it may not be really freed, since someone is still
holding a reference to it.
In that case, when TCP skb is being retransmitted, the
pointer to the frag list is being reused, while the data
in there is no longer valid.
Since we will never get frag list from the network stack,
as mac80211 doesn't advertise the capability, we can safely
free and nullify it before releasing the SKB.
Signed-off-by: Sara Sharon <sara.sharon@intel.com>
---
--- a/net/mac80211/status.c
+++ b/net/mac80211/status.c
@@ -550,6 +550,11 @@ static void ieee80211_report_used_skb(st
}
ieee80211_led_tx(local);
+
+ if (skb_has_frag_list(skb)) {
+ kfree_skb_list(skb_shinfo(skb)->frag_list);
+ skb_shinfo(skb)->frag_list = NULL;
+ }
}
/*