Re: [PATCH 2/2] mkiss: Fix use after free in sixpack_close().

[David Miller]

From: Ralf Baechle <r...@linux-mips.org>
Date: Thu, 17 Dec 2015 22:35:31 +0100

> On Thu, Dec 17, 2015 at 04:05:49PM -0500, David Miller wrote:
> 
>> Subject: [PATCH 2/2] mkiss: Fix use after free in sixpack_close().
> 
> Make that subject "... mkiss_close()."

Durrr... indeed.  Thanks for catching that.

Committed as follows:


[PATCH] mkiss: Fix use after free in mkiss_close().

Need to do the unregister_device() after all references to the driver
private have been done.

Signed-off-by: David S. Miller <da...@davemloft.net>
---
 drivers/net/hamradio/mkiss.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/hamradio/mkiss.c b/drivers/net/hamradio/mkiss.c
index 216bfd3..0b72b9d 100644
--- a/drivers/net/hamradio/mkiss.c
+++ b/drivers/net/hamradio/mkiss.c
@@ -798,13 +798,13 @@ static void mkiss_close(struct tty_struct *tty)
if (!atomic_dec_and_test(>refcnt))
down(>dead_sem);
 
-   unregister_netdev(ax->dev);
-
/* Free all AX25 frame buffers. */
kfree(ax->rbuff);
kfree(ax->xbuff);
 
ax->tty = NULL;
+
+   unregister_netdev(ax->dev);
 }
 
 /* Perform I/O control on an active ax25 channel. */
-- 
2.4.1

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[PATCH 2/2] mkiss: Fix use after free in sixpack_close().

[David Miller]

Need to do the unregister_device() after all references to the driver
private have been done.

Signed-off-by: David S. Miller 
---
 drivers/net/hamradio/mkiss.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/hamradio/mkiss.c b/drivers/net/hamradio/mkiss.c
index 216bfd3..0b72b9d 100644
--- a/drivers/net/hamradio/mkiss.c
+++ b/drivers/net/hamradio/mkiss.c
@@ -798,13 +798,13 @@ static void mkiss_close(struct tty_struct *tty)
if (!atomic_dec_and_test(>refcnt))
down(>dead_sem);
 
-   unregister_netdev(ax->dev);
-
/* Free all AX25 frame buffers. */
kfree(ax->rbuff);
kfree(ax->xbuff);
 
ax->tty = NULL;
+
+   unregister_netdev(ax->dev);
 }
 
 /* Perform I/O control on an active ax25 channel. */
-- 
2.4.1

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Re: [PATCH 2/2] mkiss: Fix use after free in sixpack_close().

[Ralf Baechle]

On Thu, Dec 17, 2015 at 04:05:49PM -0500, David Miller wrote:

> Subject: [PATCH 2/2] mkiss: Fix use after free in sixpack_close().

Make that subject "... mkiss_close()."

  Ralf
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