X-Git-Url: https://www.tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Ftincctl.c;h=3c7d3683e9da4fb375f373f4f4277f8aa13436ca;hb=5a738e685bd002661276cf6938c5b74ef1ec0ccf;hp=87bbfe0187e64e5548e15230143adf5a73393a09;hpb=5e8a37ee797b1bea33760e5e3d3c3a67e7dfbd0d;p=tinc

diff --git a/src/tincctl.c b/src/tincctl.c
index 87bbfe01..3c7d3683 100644
--- a/src/tincctl.c
+++ b/src/tincctl.c
@@ -263,19 +263,21 @@ static void disable_old_keys(const char *filename, const char *what) {
 	bool disabled = false;
 	bool block = false;
 	bool error = false;
-	FILE *r, *w;
 
-	r = fopen(filename, "r");
+	FILE *r = fopen(filename, "r");
+	FILE *w = NULL;
 
 	if(!r) {
 		return;
 	}
 
-	snprintf(tmpfile, sizeof(tmpfile), "%s.tmp", filename);
+	int result = snprintf(tmpfile, sizeof(tmpfile), "%s.tmp", filename);
 
-	struct stat st = {.st_mode = 0600};
-	fstat(fileno(r), &st);
-	w = fopenmask(tmpfile, "w", st.st_mode);
+	if(result < sizeof(tmpfile)) {
+		struct stat st = {.st_mode = 0600};
+		fstat(fileno(r), &st);
+		w = fopenmask(tmpfile, "w", st.st_mode);
+	}
 
 	while(fgets(buf, sizeof(buf), r)) {
 		if(!block && !strncmp(buf, "-----BEGIN ", 11)) {