Subject: Re: [PATCH] wifi: brcmfmac: Fix allocation size

From: Kalle Valo <[email-masked]>
Date: Tue, 17 Jan 2023 13:05:24 +0200

"Alexey V. Vissarionov" <[email-masked]> writes:

> The "pkt" is a pointer to struct sk_buff, so it's just 4 or 8
> bytes, while the structure itself is much bigger.
>
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
>
> Fixes: bbd1f932e7c45ef1 ("brcmfmac: cleanup ampdu-rx host reorder code")
> Signed-off-by: Alexey V. Vissarionov <[email-masked]>
>
> diff --git
> a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwsignal.c
> b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwsignal.c
> index 36af81975855c525..0d283456da331464 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwsignal.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwsignal.c
> @@ -1711,7 +1711,7 @@ void brcmf_fws_rxreorder(struct brcmf_if *ifp,
> struct sk_buff *pkt)
>  		buf_size = sizeof(*rfi);
>  		max_idx = reorder_data[BRCMF_RXREORDER_MAXIDX_OFFSET];
>  
> -		buf_size += (max_idx + 1) * sizeof(pkt);
> +		buf_size += (max_idx + 1) * sizeof(struct sk_buff);

Wouldn't sizeof(*pkt) be better? Just like with sizeof(*rfi) few lines
above.

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