linux-kernel - Re: [PATCH] scripts/tracepoint-update: fix memory leak in make_trace

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Message-ID: <20260118105457.755291a5@robin>
Date: Sun, 18 Jan 2026 10:54:57 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Weigang He <geoffreyhe2@...il.com>
Cc: Masami Hiramatsu <mhiramat@...nel.org>, Mathieu Desnoyers
 <mathieu.desnoyers@...icios.com>, linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, Tuo Li <islituo@...il.com>
Subject: Re: [PATCH] scripts/tracepoint-update: fix memory leak in
 make_trace_array()

On Sun, 18 Jan 2026 13:02:47 +0000
Weigang He <geoffreyhe2@...il.com> wrote:

> In make_trace_array(), if add_string() fails after some successful
> iterations, the function returns without freeing the 'vals' array that
> was allocated by previous add_string() calls.
> 
> The add_string() function uses realloc() internally with a local
> temporary variable, which means the original pointer is preserved on
> allocation failure. When make_trace_array() returns early on error,
> the previously allocated memory is leaked.
> 
> Fix this by freeing 'vals' before returning on the error path.
> 
> This bug is found by my static analysis tool and my code review.
> 
> Signed-off-by: Tuo Li <islituo@...il.com>
> ---
>  scripts/tracepoint-update.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/scripts/tracepoint-update.c b/scripts/tracepoint-update.c
> index 90046aedc97b9..7bc9d66229ddf 100644
> --- a/scripts/tracepoint-update.c
> +++ b/scripts/tracepoint-update.c
> @@ -93,8 +93,10 @@ static void make_trace_array(struct elf_tracepoint *etrace)
>  	for_each_shdr_str(len, ehdr, check_data_sec) {
>  		if (!len)
>  			continue;
> -		if (add_string(str, &vals, &count) < 0)
> +		if (add_string(str, &vals, &count) < 0) {
> +			free(vals);
>  			return;
> +		}
>  	}

It would make much more sense to have add_string() free vals, and set
vals to NULL on error.

-- Steve


>  
>  	/* If CONFIG_TRACEPOINT_VERIFY_USED is not set, there's nothing to do */