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firewire: fw-ohci: catch self_id_count == 0

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fw_core_handle_bus_reset() incorrectly relied on the assumption that
self_id_count > 0.

We check early in fw-ohci and discard the self ID complete event if
self_id_count == 0 because a valid event always has at least one self ID
packet in it (the one of the local node).  Hence treat self_id_count ==
0 like any other kind of invalid self ID buffer.

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 22:05:02 +01:00
parent c8a9a498e1
commit 016bf3dfcf
1 changed files with 4 additions and 0 deletions
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drivers/firewire/fw-ohci.c
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@ -1031,6 +1031,10 @@ static void bus_reset_tasklet(unsigned long data)
* bit extra to get the actual number of self IDs.
*/
self_id_count = (reg >> 3) & 0x3ff;
if (self_id_count == 0) {
fw_notify("inconsistent self IDs\n");
return;
}
generation = (cond_le32_to_cpu(ohci->self_id_cpu[0]) >> 16) & 0xff;
rmb();