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firewire: insist on successive self ID complete events

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The whole topology code only works if the old and new topologies which
are compared come from immediately successive self ID complete events.

If there happened bus resets without self ID complete events in the
meantime, or self ID complete events with invalid selfIDs, the topology
comparison could identify nodes wrongly, or more likely just corrupt
kernel memory or panic right away.

We now discard all nodes of the old topology and treat all current nodes
as new ones if the current self ID generation is not the previous one
plus 1.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Jarod Wilson <jwilson@redhat.com>
This commit is contained in:
Stefan Richter 2008-03-19 22:02:40 +01:00
parent 1de9e8e70f
commit a5c7f4710f
1 changed files with 12 additions and 0 deletions
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12
drivers/firewire/fw-topology.c
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@ -518,6 +518,18 @@ fw_core_handle_bus_reset(struct fw_card *card,
struct fw_node *local_node;
unsigned long flags;
/*
* If the selfID buffer is not the immediate successor of the
* previously processed one, we cannot reliably compare the
* old and new topologies.
*/
if ((generation & 0xff) != ((card->generation + 1) & 0xff) &&
card->local_node != NULL) {
fw_notify("skipped bus generations, destroying all nodes\n");
fw_destroy_nodes(card);
card->bm_retries = 0;
}
spin_lock_irqsave(&card->lock, flags);
card->node_id = node_id;