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Message-ID: <20240106141439.5bc4895a@hermes.local>
Date: Sat, 6 Jan 2024 14:14:39 -0800
From: Stephen Hemminger <stephen@...workplumber.org>
To: Maks Mishin <maks.mishinfz@...il.com>
Cc: netdev@...r.kernel.org
Subject: Re: [PATCH] ifstat: Add NULL pointer check for result of
ll_index_to_name()
On Sat, 6 Jan 2024 23:10:10 +0300
Maks Mishin <maks.mishinfz@...il.com> wrote:
> Result of ll_index_to_name() function do not being checked for NULL
> pointer before using in strdup() function.
> Add intermediate variable `name` for result of ll_index_to_name()
> function. Function result -1 when `name` is NULL.
>
> Signed-off-by: Maks Mishin <maks.mishinFZ@...il.com>
> ---
> misc/ifstat.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/misc/ifstat.c b/misc/ifstat.c
> index f6f9ba50..e6c38812 100644
> --- a/misc/ifstat.c
> +++ b/misc/ifstat.c
> @@ -129,7 +129,12 @@ static int get_nlmsg_extended(struct nlmsghdr *m, void *arg)
> abort();
>
> n->ifindex = ifsm->ifindex;
> - n->name = strdup(ll_index_to_name(ifsm->ifindex));
> +
> + const char* name = ll_index_to_name(ifsm->ifindex);
> + if (name == NULL) {
> + return -1;
> + }
> + n->name = strdup(name);
>
> if (sub_type == NO_SUB_TYPE) {
> memcpy(&n->val, RTA_DATA(tb[filter_type]), sizeof(n->val));
iproute follows kernel coding style.
checkpatch complains about this patch.
Also, there are several more strdup() calls in ifstat.
### [PATCH] ifstat: Add NULL pointer check for result of ll_index_to_name()
ERROR:TRAILING_WHITESPACE: trailing whitespace
#105: FILE: misc/ifstat.c:132:
+^I$
ERROR:POINTER_LOCATION: "foo* bar" should be "foo *bar"
#106: FILE: misc/ifstat.c:133:
+ const char* name = ll_index_to_name(ifsm->ifindex);
WARNING:BRACES: braces {} are not necessary for single statement blocks
#107: FILE: misc/ifstat.c:134:
+ if (name == NULL) {
+ return -1;
+ }
total: 2 errors, 1 warnings, 13 lines checked
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