[PATCH v3] wifi: wilc1000: use vmm_table as array in wilc struct

[PATCH v3] wifi: wilc1000: use vmm_table as array in wilc struct

[Alexis Lothoré]

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 v3:
- Use kcalloc instead of kzalloc
- Link to v2: https://lore.kernel.org/r/20231016-wilc1000_tx_oops-v2-1-8d1982a29ef1@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..9eb115c79c90 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 = kcalloc(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

Re: [PATCH v3] wifi: wilc1000: use vmm_table as array in wilc struct

[Michael Walle]

Am 2023-10-17 10:43, schrieb Alexis Lothoré:
> 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>

Reviewed-by: Michael Walle <mwalle@kernel.org>

Re: [PATCH v3] wifi: wilc1000: use vmm_table as array in wilc struct

[Jeff Johnson]

On 10/17/2023 1:43 AM, Alexis Lothoré wrote:
> 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>

Reviewed-by: Jeff Johnson <quic_jjohnson@quicinc.com>

Re: [PATCH v3] wifi: wilc1000: use vmm_table as array in wilc struct

[Kalle Valo]

Alexis Lothoré <alexis.lothore@bootlin.com> wrote:

> 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>
> Reviewed-by: Michael Walle <mwalle@kernel.org>
> Reviewed-by: Jeff Johnson <quic_jjohnson@quicinc.com>

Patch applied to wireless-next.git, thanks.

05ac1a198a63 wifi: wilc1000: use vmm_table as array in wilc struct

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20231017-wilc1000_tx_oops-v3-1-b2155f1f7bee@bootlin.com/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches