batman-adv: fix broken double-free backport leading to frequent crashes
This commit is contained in:
Matthias Schiffer
parent
6cbd658586
commit
d452a7c2cf
@ -0,0 +1,51 @@
|
||||
From: Matthias Schiffer <mschiffer@universe-factory.net>
|
||||
Date: Tue, 28 Mar 2017 14:39:48 +0200
|
||||
Subject: batman-adv: Fix double free during fragment merge error
|
||||
|
||||
diff --git a/batman-adv/patches/1003-batman-adv-Fix-double-free-during-fragment-merge-err.patch b/batman-adv/patches/1003-batman-adv-Fix-double-free-during-fragment-merge-err.patch
|
||||
new file mode 100644
|
||||
index 0000000000000000000000000000000000000000..42748aac79d082e67a8552690b3aa6e7f5ec7d12
|
||||
--- /dev/null
|
||||
+++ b/batman-adv/patches/1003-batman-adv-Fix-double-free-during-fragment-merge-err.patch
|
||||
@@ -0,0 +1,41 @@
|
||||
+From ee1415285ddb56a3c15b5b70d7b403637486382c Mon Sep 17 00:00:00 2001
|
||||
+Message-Id: <ee1415285ddb56a3c15b5b70d7b403637486382c.1490704674.git.mschiffer@universe-factory.net>
|
||||
+From: Matthias Schiffer <mschiffer@universe-factory.net>
|
||||
+Date: Tue, 28 Mar 2017 14:35:12 +0200
|
||||
+Subject: [PATCH] batman-adv: Fix double free during fragment merge error
|
||||
+
|
||||
+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 must therefore be changed to return
|
||||
+true when batadv_frag_merge_packets fails.
|
||||
+
|
||||
+Fixes: 9b3eab61754d ("batman-adv: Receive fragmented packets and merge")
|
||||
+Signed-off-by: Sven Eckelmann <sven@narfation.org>
|
||||
+[Matthias Schiffer: backport to batman-adv 2016.2]
|
||||
+---
|
||||
+ net/batman-adv/fragmentation.c | 2 --
|
||||
+ 1 file changed, 2 deletions(-)
|
||||
+
|
||||
+diff --git a/net/batman-adv/fragmentation.c b/net/batman-adv/fragmentation.c
|
||||
+index 65536db1..21e5b79f 100644
|
||||
+--- a/net/batman-adv/fragmentation.c
|
||||
++++ b/net/batman-adv/fragmentation.c
|
||||
+@@ -326,8 +326,6 @@ bool batadv_frag_skb_buffer(struct sk_buff **skb,
|
||||
+ goto out;
|
||||
+
|
||||
+ skb_out = batadv_frag_merge_packets(&head);
|
||||
+- if (!skb_out)
|
||||
+- goto out_err;
|
||||
+
|
||||
+ out:
|
||||
+ *skb = skb_out;
|
||||
+--
|
||||
+2.12.1
|
||||
+
|
||||
@ -1,80 +1,7 @@
|
||||
From: Matthias Schiffer <mschiffer@universe-factory.net>
|
||||
Date: Thu, 9 Mar 2017 19:00:12 +0100
|
||||
Subject: batman-adv: backport a few maint patches
|
||||
Date: Tue, 28 Mar 2017 14:40:20 +0200
|
||||
Subject: batman-adv: Keep fragments equally sized
|
||||
|
||||
In particular, this fixes packages of a certain range of sizes not being
|
||||
transmitted correctly, leading to hanging TCP connections.
|
||||
|
||||
diff --git a/batman-adv/patches/1003-batman-adv-Fix-double-free-during-fragment-merge-err.patch b/batman-adv/patches/1003-batman-adv-Fix-double-free-during-fragment-merge-err.patch
|
||||
new file mode 100644
|
||||
index 0000000000000000000000000000000000000000..4d754ecda1451b5c3e25f74da97fab18b7a93c87
|
||||
--- /dev/null
|
||||
+++ b/batman-adv/patches/1003-batman-adv-Fix-double-free-during-fragment-merge-err.patch
|
||||
@@ -0,0 +1,64 @@
|
||||
+From bcb7b6149bd9d1f41dae01ab47e74b8a931a650f Mon Sep 17 00:00:00 2001
|
||||
+Message-Id: <bcb7b6149bd9d1f41dae01ab47e74b8a931a650f.1489082249.git.mschiffer@universe-factory.net>
|
||||
+From: Sven Eckelmann <sven@narfation.org>
|
||||
+Date: Sun, 12 Feb 2017 11:26:33 +0100
|
||||
+Subject: [PATCH] batman-adv: Fix double free during fragment merge error
|
||||
+
|
||||
+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: 9b3eab61754d ("batman-adv: Receive fragmented packets and merge")
|
||||
+Signed-off-by: Sven Eckelmann <sven@narfation.org>
|
||||
+---
|
||||
+ 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 65536db1..c3e293a3 100644
|
||||
+--- a/net/batman-adv/fragmentation.c
|
||||
++++ b/net/batman-adv/fragmentation.c
|
||||
+@@ -233,8 +233,10 @@ err_unlock:
|
||||
+ spin_unlock_bh(&chain->lock);
|
||||
+
|
||||
+ err:
|
||||
+- if (!ret)
|
||||
++ if (!ret) {
|
||||
+ kfree(frag_entry_new);
|
||||
++ kfree_skb(skb);
|
||||
++ }
|
||||
+
|
||||
+ return ret;
|
||||
+ }
|
||||
+@@ -305,7 +307,7 @@ free:
|
||||
+ *
|
||||
+ * 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.
|
||||
+@@ -330,9 +332,9 @@ bool batadv_frag_skb_buffer(struct sk_buff **skb,
|
||||
+ goto out_err;
|
||||
+
|
||||
+ out:
|
||||
+- *skb = skb_out;
|
||||
+ ret = true;
|
||||
+ out_err:
|
||||
++ *skb = skb_out;
|
||||
+ return ret;
|
||||
+ }
|
||||
+
|
||||
+--
|
||||
+2.12.0
|
||||
+
|
||||
diff --git a/batman-adv/patches/1004-batman-adv-Keep-fragments-equally-sized.patch b/batman-adv/patches/1004-batman-adv-Keep-fragments-equally-sized.patch
|
||||
new file mode 100644
|
||||
index 0000000000000000000000000000000000000000..431c0b4a1a722c4c2ebae390bc0c90be18966023
|
||||
Loading…
Reference in New Issue
Block a user