mifare: Fix possible NULL pointer dereference in reading loop

After reading first sector, reading loop should check if sector list
is NULL in case only one valid NFC sector is present.

diff --git a/plugins/mifare.c b/plugins/mifare.c
index 0af07da..03e5921 100644 (file)
--- a/plugins/mifare.c
+++ b/plugins/mifare.c
@@ -418,7 +418,7 @@ static int mifare_read_NFC_loop(uint8_t *resp, int length, void *data)
 
 
        /* Additional sectors to read ? */;
-       if (mf_ck->g_sect_list->next != NULL) {
+       if (mf_ck->g_sect_list != NULL && mf_ck->g_sect_list->next != NULL) {
 
                err = mifare_read_sector(data,  /* cookie */
                        mf_ck->nfc_data,                /* where to store */