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([2001:41d0:303:db6b::]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-488fb7a06f3sm134028065e9.22.2026.04.21.06.49.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Apr 2026 06:49:23 -0700 (PDT) From: Tristan Madani To: Johannes Berg Cc: linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, Tristan Madani Subject: [PATCH v3 5/5] wifi: rsi: fix OOB read from firmware offset field in SDIO RX path Date: Tue, 21 Apr 2026 13:49:16 +0000 Message-ID: <20260421134916.317971-6-tristmd@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260421134916.317971-1-tristmd@gmail.com> References: <20260421134916.317971-1-tristmd@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Tristan Madani The firmware-controlled offset field in rsi_read_pkt() is validated only when rcv_pkt_len is zero (USB path). For the SDIO path, rcv_pkt_len is always positive, so the check is skipped entirely. A crafted offset can cause out-of-bounds reads past the 8192-byte pktbuffer when computing queue number, length, extended descriptor, and data pointers. Add a transport-independent bounds check to reject offset values that exceed the frame's actual_length. Fixes: dad0d04fa7ba ("rsi: data and management rx path") Signed-off-by: Tristan Madani --- Changes in v3: - Regenerated from wireless-next with proper git format-patch. Changes in v2: - New patch in v2, not present in v1. drivers/net/wireless/rsi/rsi_91x_main.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/wireless/rsi/rsi_91x_main.c b/drivers/net/wireless/rsi/rsi_91x_main.c index eb950e862ecf1..bc03066a240c1 100644 --- a/drivers/net/wireless/rsi/rsi_91x_main.c +++ b/drivers/net/wireless/rsi/rsi_91x_main.c @@ -180,6 +180,12 @@ int rsi_read_pkt(struct rsi_common *common, u8 *rx_pkt, s32 rcv_pkt_len) if (!rcv_pkt_len && offset > RSI_MAX_RX_USB_PKT_SIZE - FRAME_DESC_SZ) goto fail; + if (offset > actual_length) { + rsi_dbg(ERR_ZONE, + "%s: offset %u exceeds length %u\n", + __func__, offset, actual_length); + goto fail; + } queueno = rsi_get_queueno(frame_desc, offset); length = rsi_get_length(frame_desc, offset); -- 2.47.3