linux-kernel - RE: [PATCH] rtl8xxxu: fix slab-out-of-bounds in rtl8xxxu_sta

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Message-ID: <678a9c63a185486d89efe46e66d71315@realtek.com>
Date: Fri, 26 Dec 2025 01:55:38 +0000
From: Ping-Ke Shih <pkshih@...ltek.com>
To: Ali Tariq <alitariq45892@...il.com>,
        "Jes.Sorensen@...il.com"
	<Jes.Sorensen@...il.com>
CC: "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH] rtl8xxxu: fix slab-out-of-bounds in rtl8xxxu_sta_add

Ali Tariq <alitariq45892@...il.com> wrote:
> The driver does not set hw->sta_data_size, which causes mac80211 to
> allocate insufficient space for driver private station data in
> __sta_info_alloc(). When rtl8xxxu_sta_add() accesses members of
> struct rtl8xxxu_sta_info through sta->drv_priv, this results in a
> slab-out-of-bounds write.
> 
> KASAN report on RISC-V (VisionFive 2) with RTL8192EU adapter:
> 
>   BUG: KASAN: slab-out-of-bounds in rtl8xxxu_sta_add+0x31c/0x346
>   Write of size 8 at addr ffffffd6d3e9ae88 by task kworker/u16:0/12
> 
> Set hw->sta_data_size to sizeof(struct rtl8xxxu_sta_info) during
> probe, similar to how hw->vif_data_size is configured. This ensures
> mac80211 allocates sufficient space for the driver's per-station
> private data.
> 
> Tested on StarFive VisionFive 2 v1.2A board.
> 
> Fixes: eef55f1545c9 ("wifi: rtl8xxxu: support multiple interfaces in {add,remove}_interface()")
> 
> Cc: stable@...r.kernel.org
> 

No need empty lines after Fixes and Cc tags. I will remove them while getting
merged into rtw tree.

> Signed-off-by: Ali Tariq <alitariq45892@...il.com>

Reviewed-by: Ping-Ke Shih <pkshih@...ltek.com>