firewire: fix panic in handle_at_packet

This fixes a use-after-free bug in the handling of split transactions.
The AT DMA handler of the request was occasionally executed after the
AR DMA handler of the response.  The AT DMA handler then accessed an
already freed packet.

Reported by Johannes Berg.
http://bugzilla.kernel.org/show_bug.cgi?id=9617

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Tested-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Jarod Wilson <jwilson@redhat.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/firewire/fw-transaction.c b/drivers/firewire/fw-transaction.c
index 99529e59a0b1..e6f1bda38940 100644
--- a/drivers/firewire/fw-transaction.c
+++ b/drivers/firewire/fw-transaction.c
@@ -736,6 +736,12 @@ fw_core_handle_response(struct fw_card *card, struct fw_packet *p)
                 break;
         }
 
+        /*
+         * The response handler may be executed while the request handler
+         * is still pending.  Cancel the request handler.
+         */
+        card->driver->cancel_packet(card, &t->packet);
+
         t->callback(card, rcode, data, data_length, t->callback_data);
 }
 EXPORT_SYMBOL(fw_core_handle_response);