linux-kernel - [PATCH 3.4 19/35] firewire: net: fix use after free

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Message-Id: <20140321001054.803303910@linuxfoundation.org>
Date:	Thu, 20 Mar 2014 17:11:10 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
	Stefan Richter <stefanr@...6.in-berlin.de>
Subject: [PATCH 3.4 19/35] firewire: net: fix use after free

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stefan Richter <stefanr@...6.in-berlin.de>

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@...cle.com>
Signed-off-by: Stefan Richter <stefanr@...6.in-berlin.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/firewire/net.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/firewire/net.c
+++ b/drivers/firewire/net.c
@@ -1014,8 +1014,6 @@ 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",
@@ -1023,8 +1021,10 @@ static void fwnet_write_complete(struct
 
 			errors_skipped = 0;
 			last_rcode = rcode;
-		} else
+		} else {
 			errors_skipped++;
+		}
+		fwnet_transmit_packet_failed(ptask);
 	}
 }
 


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