iwlwifi: make sure cur_fw_img is valid before accessing img

Harden the fwrt->fw->img array access by making sure the cur_fw_img
value doesn't go out of bounds.

Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

diff --git a/drivers/net/wireless/intel/iwlwifi/fw/dbg.h b/drivers/net/wireless/intel/iwlwifi/fw/dbg.h
index d8090d4b5c435acd88a9e243100485a66d7ac2b0..330229d2a61d35dd2bd3caeb5a584a3e2c71e774 100644 (file)
--- a/drivers/net/wireless/intel/iwlwifi/fw/dbg.h
+++ b/drivers/net/wireless/intel/iwlwifi/fw/dbg.h
@@ -381,6 +381,7 @@ static inline bool iwl_fw_dbg_is_paging_enabled(struct iwl_fw_runtime *fwrt)
 {
        return iwl_fw_dbg_type_on(fwrt, IWL_FW_ERROR_DUMP_PAGING) &&
                !fwrt->trans->cfg->gen2 &&
+               fwrt->cur_fw_img < IWL_UCODE_TYPE_MAX &&
                fwrt->fw->img[fwrt->cur_fw_img].paging_mem_size &&
                fwrt->fw_paging_db[0].fw_paging_block;
 }