* [patch] tty: handle NULL parameters in free_tty_struct()
@ 2012-07-20 7:06 Dan Carpenter
2012-07-20 9:48 ` Alan Cox
0 siblings, 1 reply; 3+ messages in thread
From: Dan Carpenter @ 2012-07-20 7:06 UTC (permalink / raw)
To: Greg Kroah-Hartman; +Cc: linux-kernel, kernel-janitors
We sometimes pass NULL pointers to free_tty_struct(). One example where
it can happen is in the error handling code in pty_common_install().
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index ca7c25d..e49b839 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -181,6 +181,8 @@ struct tty_struct *alloc_tty_struct(void)
void free_tty_struct(struct tty_struct *tty)
{
+ if (!tty)
+ return;
if (tty->dev)
put_device(tty->dev);
kfree(tty->write_buf);
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [patch] tty: handle NULL parameters in free_tty_struct()
2012-07-20 7:06 [patch] tty: handle NULL parameters in free_tty_struct() Dan Carpenter
@ 2012-07-20 9:48 ` Alan Cox
2012-07-20 21:32 ` Jiri Slaby
0 siblings, 1 reply; 3+ messages in thread
From: Alan Cox @ 2012-07-20 9:48 UTC (permalink / raw)
To: Dan Carpenter; +Cc: Greg Kroah-Hartman, linux-kernel, kernel-janitors
On Fri, 20 Jul 2012 10:06:34 +0300
Dan Carpenter <dan.carpenter@oracle.com> wrote:
> We sometimes pass NULL pointers to free_tty_struct(). One example where
> it can happen is in the error handling code in pty_common_install().
>
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Alan Cox <alan@linux.intel.com>
We probably shouldn't be passing NULLs there but making
free_tty_struct(NULL) a no-op matches the kfree and other behaviours and
is robust.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [patch] tty: handle NULL parameters in free_tty_struct()
2012-07-20 9:48 ` Alan Cox
@ 2012-07-20 21:32 ` Jiri Slaby
0 siblings, 0 replies; 3+ messages in thread
From: Jiri Slaby @ 2012-07-20 21:32 UTC (permalink / raw)
To: Alan Cox; +Cc: Dan Carpenter, Greg Kroah-Hartman, linux-kernel, kernel-janitors
On 07/20/2012 11:48 AM, Alan Cox wrote:
> On Fri, 20 Jul 2012 10:06:34 +0300
> Dan Carpenter <dan.carpenter@oracle.com> wrote:
>
>> We sometimes pass NULL pointers to free_tty_struct(). One example where
>> it can happen is in the error handling code in pty_common_install().
>>
>> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
>
> Acked-by: Alan Cox <alan@linux.intel.com>
>
> We probably shouldn't be passing NULLs there but making
> free_tty_struct(NULL) a no-op matches the kfree and other behaviours and
> is robust.
Yes, this was unintended. Good catch, Dan.
thanks,
--
js
suse labs
^ permalink raw reply [flat|nested] 3+ messages in thread
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2012-07-20 7:06 [patch] tty: handle NULL parameters in free_tty_struct() Dan Carpenter
2012-07-20 9:48 ` Alan Cox
2012-07-20 21:32 ` Jiri Slaby
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