[PATCH] firewire: fix panic in handle_at_packet

[Stefan Richter <stefanr@s5r6.in-berlin.de>]

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 <johannes@sipsolutions.net>.
http://bugzilla.kernel.org/show_bug.cgi?id=9617

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
---
 drivers/firewire/fw-transaction.c |    6 ++++++
 1 file changed, 6 insertions(+)

Index: linux/drivers/firewire/fw-transaction.c
===================================================================
--- linux.orig/drivers/firewire/fw-transaction.c
+++ linux/drivers/firewire/fw-transaction.c
@@ -737,6 +737,12 @@ fw_core_handle_response(struct fw_card *
 		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);

-- 
Stefan Richter
-=====-==--- --== =----
http://arcgraph.de/sr/