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Code

add extra sanity checks in madwifi

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@10266 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
nbd 2008-01-26 04:19:50 +00:00
parent adeafa7cfb
commit 3610f7a9ee
1 changed files with 61 additions and 0 deletions
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61
package/madwifi/patches/316-skb_checks.patch Normal file
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@ -0,0 +1,61 @@
Index: madwifi-dfs-r3252/net80211/ieee80211_input.c
===================================================================
--- madwifi-dfs-r3252.orig/net80211/ieee80211_input.c 2008-01-26 05:14:46.815962139 +0100
+++ madwifi-dfs-r3252/net80211/ieee80211_input.c 2008-01-26 05:18:37.005079863 +0100
@@ -740,8 +740,10 @@
skb1 = skb_copy(skb, GFP_ATOMIC);
/* Increment reference count after copy */
- if (skb1 != NULL)
- ieee80211_skb_copy_noderef(skb, skb1);
+ if (skb1 == NULL)
+ goto err;
+
+ ieee80211_skb_copy_noderef(skb, skb1);
/* we now have 802.3 MAC hdr followed by 802.2 LLC/SNAP; convert to EthernetII.
* Note that the frame is at least IEEE80211_MIN_LEN, due to the driver code. */
@@ -1055,9 +1057,11 @@
* assemble fragments
*/
ni->ni_rxfrag = skb_copy(skb, GFP_ATOMIC);
- /* We duplicate the reference after skb_copy */
- ieee80211_skb_copy_noderef(skb, ni->ni_rxfrag);
- ieee80211_dev_kfree_skb(&skb);
+ if (ni->ni_rxfrag) {
+ /* We duplicate the reference after skb_copy */
+ ieee80211_skb_copy_noderef(skb, ni->ni_rxfrag);
+ ieee80211_dev_kfree_skb(&skb);
+ }
}
/*
* Check that we have enough space to hold
@@ -1071,7 +1075,7 @@
(skb_end_pointer(skb) - skb->head),
GFP_ATOMIC);
/* We duplicate the reference after skb_copy */
- if (skb != ni->ni_rxfrag)
+ if ((skb != ni->ni_rxfrag) && ni->ni_rxfrag)
ieee80211_skb_copy_noderef(skb, ni->ni_rxfrag);
ieee80211_dev_kfree_skb(&skb);
}
@@ -1134,7 +1138,8 @@
if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
skb1 = skb_copy(skb, GFP_ATOMIC);
/* Use the BSS node for retransmitting this multicast frame */
- SKB_CB(skb1)->ni = ieee80211_ref_node(vap->iv_bss);
+ if (skb1)
+ SKB_CB(skb1)->ni = ieee80211_ref_node(vap->iv_bss);
}
else {
/*
@@ -1277,6 +1282,9 @@
/* XXX: does this always work? */
tskb = skb_copy(skb, GFP_ATOMIC);
+ if (!tskb)
+ return skb;
+
/* We duplicate the reference after skb_copy */
ieee80211_skb_copy_noderef(skb, tskb);
ieee80211_dev_kfree_skb(&skb);