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From:   =?utf-8?q?Alexis_Lothor=C3=A9?= <alexis.lothore@bootlin.com>
Date:   Mon, 16 Oct 2023 10:29:52 +0200
Subject: [PATCH v2] wifi: wilc1000: use vmm_table as array in wilc struct
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Message-Id: <20231016-wilc1000_tx_oops-v2-1-8d1982a29ef1@bootlin.com>
To:     Claudiu Beznea <claudiu.beznea@tuxon.dev>,
        Kalle Valo <kvalo@kernel.org>,
        Michael Walle <mwalle@kernel.org>
Cc:     linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org,
        Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
        Ajay Singh <ajay.kathat@microchip.com>, stable@vger.kernel.org,
        =?utf-8?q?Alexis_Lothor=C3=A9?= <alexis.lothore@bootlin.com>
Precedence: bulk

From: Ajay Singh <ajay.kathat@microchip.com>

Enabling KASAN and running some iperf tests raises some memory issues with
vmm_table:

BUG: KASAN: slab-out-of-bounds in wilc_wlan_handle_txq+0x6ac/0xdb4
Write of size 4 at addr c3a61540 by task wlan0-tx/95

KASAN detects that we are writing data beyond range allocated to vmm_table.
There is indeed a mismatch between the size passed to allocator in
wilc_wlan_init, and the range of possible indexes used later: allocation
size is missing a multiplication by sizeof(u32)

Fixes: 40b717bfcefa ("wifi: wilc1000: fix DMA on stack objects")
Cc: stable@vger.kernel.org
Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
Signed-off-by: Alexis Lothoré <alexis.lothore@bootlin.com>
---
Changes in v2:
- keep dedicated dynamic allocation for vmm_table
- Link to v1: https://lore.kernel.org/r/20231013-wilc1000_tx_oops-v1-1-3761beb9524d@bootlin.com
---
 drivers/net/wireless/microchip/wilc1000/wlan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/microchip/wilc1000/wlan.c b/drivers/net/wireless/microchip/wilc1000/wlan.c
index 58bbf50081e4..e4113f2dfadf 100644
--- a/drivers/net/wireless/microchip/wilc1000/wlan.c
+++ b/drivers/net/wireless/microchip/wilc1000/wlan.c
@@ -1492,7 +1492,7 @@ int wilc_wlan_init(struct net_device *dev)
 	}
 
 	if (!wilc->vmm_table)
-		wilc->vmm_table = kzalloc(WILC_VMM_TBL_SIZE, GFP_KERNEL);
+		wilc->vmm_table = kzalloc(WILC_VMM_TBL_SIZE * sizeof(u32), GFP_KERNEL);
 
 	if (!wilc->vmm_table) {
 		ret = -ENOBUFS;

---
base-commit: ea12d85cbfd6b08fff40a4fefccc011b6cfadf8e
change-id: 20231012-wilc1000_tx_oops-58ce91ee3e93

Best regards,
-- 
Alexis Lothoré, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com