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Date:   Wed,  1 Mar 2017 16:53:32 +0100
From:   Simon Wunderlich <>
        Sven Eckelmann <>,
        Simon Wunderlich <>
Subject: [PATCH 1/2] batman-adv: Fix double free during fragment merge error

From: Sven Eckelmann <>

The function batadv_frag_skb_buffer was supposed not to consume the skbuff
on errors. This was followed in the helper function
batadv_frag_insert_packet when the skb would potentially be inserted in the
fragment queue. But it could happen that the next helper function
batadv_frag_merge_packets would try to merge the fragments and fail. This
results in a kfree_skb of all the enqueued fragments (including the just
inserted one). batadv_recv_frag_packet would detect the error in
batadv_frag_skb_buffer and try to free the skb again.

The behavior of batadv_frag_skb_buffer (and its helper
batadv_frag_insert_packet) must therefore be changed to always consume the
skbuff to have a common behavior and avoid the double kfree_skb.

Fixes: 610bfc6bc99b ("batman-adv: Receive fragmented packets and merge")
Signed-off-by: Sven Eckelmann <>
Signed-off-by: Simon Wunderlich <>
 net/batman-adv/fragmentation.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/net/batman-adv/fragmentation.c b/net/batman-adv/fragmentation.c
index 0854ebd8613e..31e97e9aee0d 100644
--- a/net/batman-adv/fragmentation.c
+++ b/net/batman-adv/fragmentation.c
@@ -239,8 +239,10 @@ static bool batadv_frag_insert_packet(struct batadv_orig_node *orig_node,
-	if (!ret)
+	if (!ret) {
+		kfree_skb(skb);
+	}
 	return ret;
@@ -313,7 +315,7 @@ batadv_frag_merge_packets(struct hlist_head *chain)
  * There are three possible outcomes: 1) Packet is merged: Return true and
  * set *skb to merged packet; 2) Packet is buffered: Return true and set *skb
- * to NULL; 3) Error: Return false and leave skb as is.
+ * to NULL; 3) Error: Return false and free skb.
  * Return: true when packet is merged or buffered, false when skb is not not
  * used.
@@ -338,9 +340,9 @@ bool batadv_frag_skb_buffer(struct sk_buff **skb,
 		goto out_err;
-	*skb = skb_out;
 	ret = true;
+	*skb = skb_out;
 	return ret;

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