linux-kernel - Re: [PATCH 2/8] ftrace: Fix possible NULL dereferencing in __ftrace_hash_rec

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Date:	Wed, 21 Dec 2011 10:23:42 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	fweisbec@...il.com, mingo@...hat.com, paulus@...ba.org,
	acme@...stprotocols.net, a.p.zijlstra@...llo.nl,
	linux-kernel@...r.kernel.org, aarapov@...hat.com
Subject: Re: [PATCH 2/8] ftrace: Fix possible NULL dereferencing in
 __ftrace_hash_rec_update

On Wed, 2011-12-21 at 12:48 +0100, Jiri Olsa wrote:
> We need to check the existence of the other_hash before
> we touch its count variable.
> 
> This issue is hit only when non global ftrace_ops is used.
> The global ftrace_ops is initialized with empty hashes.
> 

As this wasn't the first time this bug showed up, I fixed this by this
patch:

https://lkml.org/lkml/2011/12/21/197

So you can remove this patch as well.

-- Steve

> Signed-off-by: Jiri Olsa <jolsa@...hat.com>
> ---
>  kernel/trace/ftrace.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
> 
> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> index 09007c0..7eb702f 100644
> --- a/kernel/trace/ftrace.c
> +++ b/kernel/trace/ftrace.c
> @@ -1372,7 +1372,8 @@ static void __ftrace_hash_rec_update(struct ftrace_ops *ops,
>  			if (filter_hash && in_hash && !in_other_hash)
>  				match = 1;
>  			else if (!filter_hash && in_hash &&
> -				 (in_other_hash || !other_hash->count))
> +				 (in_other_hash ||
> +				  !other_hash || !other_hash->count))
>  				match = 1;
>  		}
>  		if (!match)


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