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Message-ID: <87y1ezwbk8.fsf@nvidia.com>
Date: Wed, 15 Nov 2023 11:23:28 +0100
From: Petr Machata <petrm@...dia.com>
To: heminhong <heminhong@...inos.cn>
CC: <stephen@...workplumber.org>, <netdev@...r.kernel.org>
Subject: Re: [PATCH v3] iproute2: prevent memory leak
heminhong <heminhong@...inos.cn> writes:
> When the return value of rtnl_talk() is greater than
> or equal to 0, 'answer' will be allocated.
> The 'answer' should be free after using,
> otherwise it will cause memory leak.
The patch also frees the memory when rtnl_talk() returns < 0. In that
case the answer has not been initialized. You should probably initialize
the answer to NULL.
> Signed-off-by: heminhong <heminhong@...inos.cn>
> ---
> ip/link_gre.c | 1 +
> ip/link_gre6.c | 1 +
> ip/link_ip6tnl.c | 1 +
> ip/link_iptnl.c | 1 +
> ip/link_vti.c | 1 +
> ip/link_vti6.c | 1 +
> 6 files changed, 6 insertions(+)
>
> diff --git a/ip/link_gre.c b/ip/link_gre.c
> index 74a5b5e9..3d3fcbae 100644
> --- a/ip/link_gre.c
> +++ b/ip/link_gre.c
> @@ -113,6 +113,7 @@ static int gre_parse_opt(struct link_util *lu, int argc, char **argv,
> get_failed:
> fprintf(stderr,
> "Failed to get existing tunnel info.\n");
> + free(answer);
> return -1;
> }
>
The context of this hunk is:
struct nlmsghdr *answer;
... answer untouched here ...
if (rtnl_talk(&rth, &req.n, &answer) < 0) {
get_failed:
+ free(answer);
fprintf(stderr,
"Failed to get existing tunnel info.\n");
return -1;
}
If rtnl_talk() fails, answer is never initialized, so passing it to free
is invalid.
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