linux-kernel - [PATCH 4.4 072/113] iwlegacy: ensure loop counter addr does not wrap and cause an infinite loop

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Message-Id: <20200227132223.297849844@linuxfoundation.org>
Date:   Thu, 27 Feb 2020 14:36:28 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Colin Ian King <colin.king@...onical.com>,
        Stanislaw Gruszka <stf_xl@...pl>,
        Kalle Valo <kvalo@...eaurora.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 072/113] 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/iwlegacy/common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/iwlegacy/common.c b/drivers/net/wireless/iwlegacy/common.c
index 887114582583b..544ab3750ea6e 100644
--- a/drivers/net/wireless/iwlegacy/common.c
+++ b/drivers/net/wireless/iwlegacy/common.c
@@ -717,7 +717,7 @@ 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