ctrl_iface: BSS command to skip info items if parsing fails

In some cases parsing of the mesh scan info for a BSS or the P2P scan
info can fail. One reason can be that the Beacon/Probe Response frame
contained malformed length vendor IEs which are not parsed when adding
to the BSS table. Instead of skipping the whole BSS of the BSS command,
just skip the part that failed to parse.

Signed-off-by: Jonathan Afek <jonathanx.afek@intel.com>

wpa_supplicant/ctrl_iface.c

@@ -4298,9 +4298,10 @@ static int print_bss_info(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
 	if (mask & WPA_BSS_MASK_P2P_SCAN) {
 		ie = (const u8 *) (bss + 1);
 		ret = wpas_p2p_scan_result_text(ie, bss->ie_len, pos, end);
-		if (ret < 0 || ret >= end - pos)
+		if (ret >= end - pos)
 			return 0;
-		pos += ret;
+		if (ret > 0)
+			pos += ret;
 	}
 #endif /* CONFIG_P2P */
 
@@ -4381,9 +4382,10 @@ static int print_bss_info(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
 	if (mask & WPA_BSS_MASK_MESH_SCAN) {
 		ie = (const u8 *) (bss + 1);
 		ret = wpas_mesh_scan_result_text(ie, bss->ie_len, pos, end);
-		if (ret < 0 || ret >= end - pos)
+		if (ret >= end - pos)
 			return 0;
-		pos += ret;
+		if (ret > 0)
+			pos += ret;
 	}
 #endif /* CONFIG_MESH */