netdev - [PATCH][next] iwlegacy: ensure loop counter addr does not wrap and cause an infinite loop

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Message-Id: <20200126000954.22807-1-colin.king@canonical.com>
Date:   Sun, 26 Jan 2020 00:09:54 +0000
From:   Colin King <colin.king@...onical.com>
To:     Stanislaw Gruszka <stf_xl@...pl>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S . Miller" <davem@...emloft.net>,
        Meenakshi Venkataraman <meenakshi.venkataraman@...el.com>,
        Wey-Yi Guy <wey-yi.w.guy@...el.com>,
        Johannes Berg <johannes.berg@...el.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] iwlegacy: ensure loop counter addr does not wrap and cause an infinite loop

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

The loop counter addr is a u16 where as the upper limit of the loop
is a 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>
---
 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 d966b29b45ee..348c17ce72f5 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;
-- 
2.24.0