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Message-ID: <20240708151936.331d1096@hermes.local>
Date: Mon, 8 Jul 2024 15:19:36 -0700
From: Stephen Hemminger <stephen@...workplumber.org>
To: Maks Mishin <maks.mishinfz@...il.com>
Cc: netdev@...r.kernel.org
Subject: Re: [PATCH] iproute_lwtunnel: Add check for result of get_u32
function
On Sun, 7 Jul 2024 18:49:28 +0300
Maks Mishin <maks.mishinfz@...il.com> wrote:
> Signed-off-by: Maks Mishin <maks.mishinFZ@...il.com>
> ---
> ip/iproute_lwtunnel.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/ip/iproute_lwtunnel.c b/ip/iproute_lwtunnel.c
> index b4df4348..2946fa4d 100644
> --- a/ip/iproute_lwtunnel.c
> +++ b/ip/iproute_lwtunnel.c
> @@ -1484,7 +1484,8 @@ static int parse_encap_seg6local(struct rtattr *rta, size_t len, int *argcp,
> NEXT_ARG();
> if (hmac_ok++)
> duparg2("hmac", *argv);
> - get_u32(&hmac, *argv, 0);
> + if (get_u32(&hmac, *argv, 0) || hmac == 0)
> + invarg("\"hmac\" value is invalid\n", *argv);
> } else {
> continue;
> }
There is another unchecked call to get_u32() in the same file.
Please fix all of them and add more detail in commit message.
If the get_XXX functions are modified to force checks on return value get:
iproute_lwtunnel.c: In function ‘parse_encap_seg6’:
iproute_lwtunnel.c:972:25: warning: ignoring return value of ‘get_u32’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
972 | get_u32(&hmac, *argv, 0);
| ^~~~~~~~~~~~~~~~~~~~~~~~
iproute_lwtunnel.c: In function ‘parse_encap_seg6local’:
iproute_lwtunnel.c:1487:33: warning: ignoring return value of ‘get_u32’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
1487 | get_u32(&hmac, *argv, 0);
| ^~~~~~~~~~~~~~~~~~~~~~~~
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