wifi: iwlegacy: 4965: corrected fix for potential off-by-one overflow…

… in il4965_rs_fill_link_cmd()

commit 6d0ef72 upstream.

This reverts commit a8eb8e6 as
it can cause invalid link quality command sent to the firmware
and address the off-by-one issue by fixing condition of while loop.

Cc: stable@vger.kernel.org
Fixes: a8eb8e6 ("wifi: iwlegacy: 4965: fix potential off-by-one overflow in il4965_rs_fill_link_cmd()")
Signed-off-by: Stanislaw Gruszka <stf_xl@wp.pl>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220815073737.GA999388@wp.pl
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/net/wireless/intel/iwlegacy/4965-rs.c

@@ -2403,7 +2403,7 @@ il4965_rs_fill_link_cmd(struct il_priv *il, struct il_lq_sta *lq_sta,
 		/* Repeat initial/next rate.
 		 * For legacy IL_NUMBER_TRY == 1, this loop will not execute.
 		 * For HT IL_HT_NUMBER_TRY == 3, this executes twice. */
-		while (repeat_rate > 0) {
+		while (repeat_rate > 0 && idx < (LINK_QUAL_MAX_RETRY_NUM - 1)) {
 			if (is_legacy(tbl_type.lq_type)) {
 				if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
 					ant_toggle_cnt++;
@@ -2422,8 +2422,6 @@ il4965_rs_fill_link_cmd(struct il_priv *il, struct il_lq_sta *lq_sta,
 			    cpu_to_le32(new_rate);
 			repeat_rate--;
 			idx++;
-			if (idx >= LINK_QUAL_MAX_RETRY_NUM)
-				goto out;
 		}
 
 		il4965_rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
@@ -2468,7 +2466,6 @@ il4965_rs_fill_link_cmd(struct il_priv *il, struct il_lq_sta *lq_sta,
 		repeat_rate--;
 	}
 
-out:
 	lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
 	lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;