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| author | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2014-02-18 22:25:15 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-03-23 21:38:16 -0700 |
| commit | f5befc2c193dbe92826a382e16cb50e8640a4f62 (patch) | |
| tree | 0263351d1b42fe6b515c7e77a3a4fbd21f564174 | |
| parent | d6a6d1f38ce55aa5a7d8aab972176660b19fd7ab (diff) | |
| download | lwn-f5befc2c193dbe92826a382e16cb50e8640a4f62.tar.gz lwn-f5befc2c193dbe92826a382e16cb50e8640a4f62.zip | |
firewire: net: fix use after free
commit 8987583366ae9e03c306c2b7d73bdb952df1d08d upstream.
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 <dan.carpenter@oracle.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/firewire/net.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/firewire/net.c b/drivers/firewire/net.c index 815b0fcbe918..7bdb6fe63236 100644 --- a/drivers/firewire/net.c +++ b/drivers/firewire/net.c @@ -929,8 +929,6 @@ static void fwnet_write_complete(struct fw_card *card, int rcode, 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", @@ -938,8 +936,10 @@ static void fwnet_write_complete(struct fw_card *card, int rcode, errors_skipped = 0; last_rcode = rcode; - } else + } else { errors_skipped++; + } + fwnet_transmit_packet_failed(ptask); } } |