Re: [PATCH] fprobe: Check rethook_alloc() return in rethook initialization

[Google]

On Tue, 25 Oct 2022 00:12:08 -0300
Rafael Mendonca <rafaelmendsr@xxxxxxxxx> wrote:

> Check if fp->rethook succeeded to be allocated. Otherwise, if
> rethook_alloc() fails, then we end up dereferencing a NULL pointer in
> rethook_add_node().

Good catch!

Acked-by: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>

Thank you!

> 
> Fixes: 5b0ab78998e3 ("fprobe: Add exit_handler support")
> Signed-off-by: Rafael Mendonca <rafaelmendsr@xxxxxxxxx>
> ---
>  kernel/trace/fprobe.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/kernel/trace/fprobe.c b/kernel/trace/fprobe.c
> index aac63ca9c3d1..71614b2a67ff 100644
> --- a/kernel/trace/fprobe.c
> +++ b/kernel/trace/fprobe.c
> @@ -141,6 +141,8 @@ static int fprobe_init_rethook(struct fprobe *fp, int num)
>  		return -E2BIG;
>  
>  	fp->rethook = rethook_alloc((void *)fp, fprobe_exit_handler);
> +	if (!fp->rethook)
> +		return -ENOMEM;
>  	for (i = 0; i < size; i++) {
>  		struct fprobe_rethook_node *node;
>  
> -- 
> 2.34.1
> 


-- 
Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>