batadv_frag_insert_packet was unable to handle out-of-order packets because it dropped them directly. This is caused by the way the fragmentation lists is checked for the correct place to insert a fragmentation entry.

The fragmentation code keeps the fragments in lists. The fragmentation entries are kept in descending order of sequence number. The list is traversed and each entry is compared with the new fragment. If the current entry has a smaller sequence number than the new fragment then the new one has to be inserted before the current entry. This ensures that the list is still in descending order.

An out-of-order packet with a smaller sequence number than all entries in the list still has to be added to the end of the list. The used hlist has no information about the last entry in the list inside hlist_head and thus the last entry has to be calculated differently. Currently the code assumes that the iterator variable of hlist_for_each_entry can be used for this purpose after the hlist_for_each_entry finished. This is obviously wrong because the iterator variable is always NULL when the list was completely traversed.

Instead the information about the last entry has to be stored in a different variable.

This problem was introduced in 9b3eab61754d74a93c9840c296013fe3b4a1b606 ("batman-adv: Receive fragmented packets and merge").

Signed-off-by: Sven Eckelmann sven@narfation.org --- Patch was only build-tested --- fragmentation.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/fragmentation.c b/fragmentation.c index f14e54a..022d18a 100644 --- a/fragmentation.c +++ b/fragmentation.c @@ -128,6 +128,7 @@ static bool batadv_frag_insert_packet(struct batadv_orig_node *orig_node, { struct batadv_frag_table_entry *chain; struct batadv_frag_list_entry *frag_entry_new = NULL, *frag_entry_curr; + struct batadv_frag_list_entry *frag_entry_last = NULL; struct batadv_frag_packet *frag_packet; uint8_t bucket; uint16_t seqno, hdr_size = sizeof(struct batadv_frag_packet); @@ -180,11 +181,14 @@ static bool batadv_frag_insert_packet(struct batadv_orig_node *orig_node, ret = true; goto out; } + + /* store current entry because it could be the last in list */ + frag_entry_last = frag_entry_curr; }

- /* Reached the end of the list, so insert after 'frag_entry_curr'. */ - if (likely(frag_entry_curr)) { - hlist_add_after(&frag_entry_curr->list, &frag_entry_new->list); + /* Reached the end of the list, so insert after 'frag_entry_last'. */ + if (likely(frag_entry_last)) { + hlist_add_after(&frag_entry_last->list, &frag_entry_new->list); chain->size += skb->len - hdr_size; chain->timestamp = jiffies; ret = true;