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Tue, 24 Mar 2026 03:06:28 -0700 (PDT) Received: from nixos ([240b:10:ff26:df00:5eb5:51a7:1801:3c5b]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-35c03134bd2sm1919731a91.5.2026.03.24.03.06.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Mar 2026 03:06:27 -0700 (PDT) From: Yasuaki Torimaru To: linux-wireless@vger.kernel.org Cc: ajay.kathat@microchip.com, claudiu.beznea@tuxon.dev, kees@kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Yasuaki Torimaru Subject: [PATCH] wifi: wilc1000: fix u8 overflow in SSID scan buffer size calculation Date: Tue, 24 Mar 2026 19:06:24 +0900 Message-ID: <20260324100624.983458-1-yasuakitorimaru@gmail.com> X-Mailer: git-send-email 2.50.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The variable valuesize is declared as u8 but accumulates the total length of all SSIDs to scan. Each SSID contributes up to 33 bytes (IEEE80211_MAX_SSID_LEN + 1), and with WILC_MAX_NUM_PROBED_SSID (10) SSIDs the total can reach 330, which wraps around to 74 when stored in a u8. This causes kmalloc to allocate only 75 bytes while the subsequent memcpy writes up to 331 bytes into the buffer, resulting in a 256-byte heap buffer overflow. Widen valuesize from u8 to u32 to accommodate the full range. Fixes: c5c77ba18ea6 ("staging: wilc1000: Add SDIO/SPI 802.11 driver") Cc: stable@vger.kernel.org Signed-off-by: Yasuaki Torimaru Reviewed-by: Jeff Johnson --- drivers/net/wireless/microchip/wilc1000/hif.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/wireless/microchip/wilc1000/hif.c b/drivers/net/wi= reless/microchip/wilc1000/hif.c index f354b11cb919..944b2a812b63 100644 --- a/drivers/net/wireless/microchip/wilc1000/hif.c +++ b/drivers/net/wireless/microchip/wilc1000/hif.c @@ -163,7 +163,7 @@ int wilc_scan(struct wilc_vif *vif, u8 scan_source, u32 index =3D 0; u32 i, scan_timeout; u8 *buffer; - u8 valuesize =3D 0; + u32 valuesize =3D 0; u8 *search_ssid_vals =3D NULL; const u8 ch_list_len =3D request->n_channels; struct host_if_drv *hif_drv =3D vif->hif_drv; --=20 2.50.1