linux-kernel - [PATCH] wifi: iwlwifi: dvm: fix potential overflow in rs_fill_link

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Date: Wed, 13 Mar 2024 13:17:55 +0300
From: Rand Deeb <rand.sec96@...il.com>
To: Miri Korenblit <miriam.rachel.korenblit@...el.com>,
	Kalle Valo <kvalo@...nel.org>,
	Johannes Berg <johannes.berg@...el.com>,
	Gregory Greenman <gregory.greenman@...el.com>,
	Anjaneyulu <pagadala.yesu.anjaneyulu@...el.com>,
	Dmitry Antipov <dmantipov@...dex.ru>,
	linux-wireless@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: deeb.rand@...fident.ru,
	lvc-project@...uxtesting.org,
	voskresenski.stanislav@...fident.ru,
	khoroshilov@...ras.ru,
	Rand Deeb <rand.sec96@...il.com>
Subject: [PATCH] wifi: iwlwifi: dvm: fix potential overflow in rs_fill_link_cmd()

The 'index' variable in the rs_fill_link_cmd() function can reach
LINK_QUAL_MAX_RETRY_NUM during the execution of the inner loop. This
variable is used as an index for the lq_cmd->rs_table array, which has a
size of LINK_QUAL_MAX_RETRY_NUM, without proper validation.

Modify the condition of the inner loop to ensure that the 'index' variable
does not exceed LINK_QUAL_MAX_RETRY_NUM - 1, thereby preventing any
potential overflow issues.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Rand Deeb <rand.sec96@...il.com>
---
 drivers/net/wireless/intel/iwlwifi/dvm/rs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/dvm/rs.c b/drivers/net/wireless/intel/iwlwifi/dvm/rs.c
index f4a6f76cf193..e70024525eb9 100644
--- a/drivers/net/wireless/intel/iwlwifi/dvm/rs.c
+++ b/drivers/net/wireless/intel/iwlwifi/dvm/rs.c
@@ -2904,7 +2904,7 @@ static void rs_fill_link_cmd(struct iwl_priv *priv,
 		/* Repeat initial/next rate.
 		 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
 		 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
-		while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
+		while (repeat_rate > 0 && index < (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++;
-- 
2.34.1