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Message-ID: <tkrat.098225020c179827@s5r6.in-berlin.de> Date: Sun, 16 Mar 2008 00:56:41 +0100 (CET) From: Stefan Richter <stefanr@...6.in-berlin.de> To: linux1394-devel@...ts.sourceforge.net cc: linux-kernel@...r.kernel.org, Johannes Berg <johannes@...solutions.net>, Jarod Wilson <jwilson@...hat.com> Subject: [PATCH] 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 <johannes@...solutions.net>. http://bugzilla.kernel.org/show_bug.cgi?id=9617 Signed-off-by: Stefan Richter <stefanr@...6.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/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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