linux-kernel - [PATCH AUTOSEL 5.5 477/542] iwlegacy: ensure loop counter addr does not wrap and cause an infinite loop

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Message-Id: <20200214154854.6746-477-sashal@kernel.org>
Date:   Fri, 14 Feb 2020 10:47:49 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Colin Ian King <colin.king@...onical.com>,
        Stanislaw Gruszka <stf_xl@...pl>,
        Kalle Valo <kvalo@...eaurora.org>,
        Sasha Levin <sashal@...nel.org>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.5 477/542] iwlegacy: ensure loop counter addr does not wrap and cause an infinite loop

From: Colin Ian King <colin.king@...onical.com>

[ Upstream commit c2f9a4e4a5abfc84c01b738496b3fd2d471e0b18 ]

The loop counter addr is a u16 where as the upper limit of the loop
is an int. In the unlikely event that the il->cfg->eeprom_size is
greater than 64K then we end up with an infinite loop since addr will
wrap around an never reach upper loop limit. Fix this by making addr
an int.

Addresses-Coverity: ("Infinite loop")
Fixes: be663ab67077 ("iwlwifi: split the drivers for agn and legacy devices 3945/4965")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
Acked-by: Stanislaw Gruszka <stf_xl@...pl>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/intel/iwlegacy/common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/intel/iwlegacy/common.c b/drivers/net/wireless/intel/iwlegacy/common.c
index d966b29b45ee7..348c17ce72f5c 100644
--- a/drivers/net/wireless/intel/iwlegacy/common.c
+++ b/drivers/net/wireless/intel/iwlegacy/common.c
@@ -699,7 +699,7 @@ il_eeprom_init(struct il_priv *il)
 	u32 gp = _il_rd(il, CSR_EEPROM_GP);
 	int sz;
 	int ret;
-	u16 addr;
+	int addr;
 
 	/* allocate eeprom */
 	sz = il->cfg->eeprom_size;
-- 
2.20.1