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SubjectRe: [PATCH v2] wifi: wilc1000: use vmm_table as array in wilc struct
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On 10/16/2023 1:29 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>
> ---
> 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);

this is probably OK since the values are constant, but kcalloc() is
generally preferred

>
> if (!wilc->vmm_table) {
> ret = -ENOBUFS;
>
> ---
> base-commit: ea12d85cbfd6b08fff40a4fefccc011b6cfadf8e
> change-id: 20231012-wilc1000_tx_oops-58ce91ee3e93
>
> Best regards,

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