Date: Tue, 18 Feb 2014 22:25:15 +0100 From: Stefan Richter Subject: firewire: net: fix use after free Commit 8408dc1c14c1 "firewire: net: use dev_printk API" introduced a use-after-free in a failure path. fwnet_transmit_packet_failed(ptask) may free ptask, then the dev_err() call dereferenced it. The fix is straightforward; simply reorder the two calls. Reported-by: Dan Carpenter Cc: stable@vger.kernel.org # v3.4+ Signed-off-by: Stefan Richter --- drivers/firewire/net.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- a/drivers/firewire/net.c +++ b/drivers/firewire/net.c @@ -928,19 +928,19 @@ static void fwnet_write_complete(struct if (rcode == RCODE_COMPLETE) { fwnet_transmit_packet_done(ptask); } else { - fwnet_transmit_packet_failed(ptask); - if (printk_timed_ratelimit(&j, 1000) || rcode != last_rcode) { dev_err(&ptask->dev->netdev->dev, "fwnet_write_complete failed: %x (skipped %d)\n", rcode, errors_skipped); errors_skipped = 0; last_rcode = rcode; - } else + } else { errors_skipped++; + } + fwnet_transmit_packet_failed(ptask); } } static int fwnet_send_packet(struct fwnet_packet_task *ptask)