linux-kernel - [PATCH 4.19 89/91] iwlwifi: mvm: fix an out-of-bound access

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Message-Id: <20190814165753.986012528@linuxfoundation.org>
Date:   Wed, 14 Aug 2019 19:01:52 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
        Johannes Berg <johannes.berg@...el.com>
Subject: [PATCH 4.19 89/91] iwlwifi: mvm: fix an out-of-bound access

From: Emmanuel Grumbach <emmanuel.grumbach@...el.com>

commit ba3224db78034435e9ff0247277cce7c7bb1756c upstream.

The index for the elements of the ACPI object we dereference
was static. This means that if we called the function twice
we wouldn't start from 3 again, but rather from the latest
index we reached in the previous call.
This was dutifully reported by KASAN.

Fix this.

Cc: stable@...r.kernel.org
Fixes: 6996490501ed ("iwlwifi: mvm: add support for EWRD (Dynamic SAR) ACPI table")
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@...el.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/wireless/intel/iwlwifi/mvm/fw.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
@@ -724,7 +724,7 @@ static int iwl_mvm_sar_get_ewrd_table(st
 
 	for (i = 0; i < n_profiles; i++) {
 		/* the tables start at element 3 */
-		static int pos = 3;
+		int pos = 3;
 
 		/* The EWRD profiles officially go from 2 to 4, but we
 		 * save them in sar_profiles[1-3] (because we don't