From: Maks Mishin <maks.mishinfz@gmail.com>
Date: Sat, 6 Jan 2024 19:04:23 +0000 (+0300)
Subject: lnstat: Fix deref of null in print_json() function
X-Git-Tag: v6.7.0~1
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=a193733b7a7ef1e65e1b88045c32f96ed16caeb9;p=thirdparty%2Fiproute2.git

lnstat: Fix deref of null in print_json() function

Now pointer `jw` is being checked for NULL before using
in function `jsonw_start_object`.
Added exit from function when `jw==NULL`.

Found by RASU JSC

Signed-off-by: Maks Mishin <maks.mishinFZ@gmail.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---

diff --git a/misc/lnstat.c b/misc/lnstat.c
index c3f2999cc..f802a0f35 100644
--- a/misc/lnstat.c
+++ b/misc/lnstat.c
@@ -112,6 +112,10 @@ static void print_json(FILE *of, const struct lnstat_file *lnstat_files,
 	json_writer_t *jw = jsonw_new(of);
 	int i;
 
+	if (jw == NULL) {
+		fprintf(stderr, "Failed to create JSON writer\n");
+		exit(1);
+	}
 	jsonw_start_object(jw);
 	for (i = 0; i < fp->num; i++) {
 		const struct lnstat_field *lf = fp->params[i].lf;