conf: fix suggest_default_idmap()

We need to remove the newline otherwise lxc_safe_uint() will fail as it detects
an invalid (non-numeric) char in the string.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

src/lxc/conf.c

@@ -4513,6 +4513,7 @@ void suggest_default_idmap(void)
 		return;
 	}
 	while (getline(&line, &len, f) != -1) {
+		size_t no_newline = 0;
 		char *p = strchr(line, ':'), *p2;
 		if (*line == '#')
 			continue;
@@ -4529,6 +4530,9 @@ void suggest_default_idmap(void)
 		p2++;
 		if (!*p2)
 			continue;
+		no_newline = strcspn(p2, "\n");
+		p2[no_newline] = '\0';
+
 		if (lxc_safe_uint(p, &uid) < 0)
 			WARN("Could not parse UID.");
 		if (lxc_safe_uint(p2, &urange) < 0)
@@ -4544,6 +4548,7 @@ void suggest_default_idmap(void)
 		return;
 	}
 	while (getline(&line, &len, f) != -1) {
+		size_t no_newline = 0;
 		char *p = strchr(line, ':'), *p2;
 		if (*line == '#')
 			continue;
@@ -4560,6 +4565,9 @@ void suggest_default_idmap(void)
 		p2++;
 		if (!*p2)
 			continue;
+		no_newline = strcspn(p2, "\n");
+		p2[no_newline] = '\0';
+
 		if (lxc_safe_uint(p, &gid) < 0)
 			WARN("Could not parse GID.");
 		if (lxc_safe_uint(p2, &grange) < 0)