linux-kernel - [PATCH 4.9 098/125] wil6210: fix length check in __wmi

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Date:   Wed, 22 Apr 2020 11:56:55 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Lior David <qca_liord@....qualcomm.com>,
        Maya Erez <qca_merez@....qualcomm.com>,
        Kalle Valo <kvalo@....qualcomm.com>,
        Lee Jones <lee.jones@...aro.org>
Subject: [PATCH 4.9 098/125] wil6210: fix length check in __wmi_send

From: Lior David <qca_liord@....qualcomm.com>

[ Upstream commit 26a6d5274865532502c682ff378ac8ebe2886238 ]

The current length check:
sizeof(cmd) + len > r->entry_size
will allow very large values of len (> U16_MAX - sizeof(cmd))
and can cause a buffer overflow. Fix the check to cover this case.
In addition, ensure the mailbox entry_size is not too small,
since this can also bypass the above check.

Signed-off-by: Lior David <qca_liord@....qualcomm.com>
Signed-off-by: Maya Erez <qca_merez@....qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@....qualcomm.com>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/wireless/ath/wil6210/interrupt.c |   22 +++++++++++++++++++++-
 drivers/net/wireless/ath/wil6210/wmi.c       |    2 +-
 2 files changed, 22 insertions(+), 2 deletions(-)

--- a/drivers/net/wireless/ath/wil6210/interrupt.c
+++ b/drivers/net/wireless/ath/wil6210/interrupt.c
@@ -356,6 +356,25 @@ static void wil_cache_mbox_regs(struct w
 	wil_mbox_ring_le2cpus(&wil->mbox_ctl.tx);
 }
 
+static bool wil_validate_mbox_regs(struct wil6210_priv *wil)
+{
+	size_t min_size = sizeof(struct wil6210_mbox_hdr) +
+		sizeof(struct wmi_cmd_hdr);
+
+	if (wil->mbox_ctl.rx.entry_size < min_size) {
+		wil_err(wil, "rx mbox entry too small (%d)\n",
+			wil->mbox_ctl.rx.entry_size);
+		return false;
+	}
+	if (wil->mbox_ctl.tx.entry_size < min_size) {
+		wil_err(wil, "tx mbox entry too small (%d)\n",
+			wil->mbox_ctl.tx.entry_size);
+		return false;
+	}
+
+	return true;
+}
+
 static irqreturn_t wil6210_irq_misc(int irq, void *cookie)
 {
 	struct wil6210_priv *wil = cookie;
@@ -391,7 +410,8 @@ static irqreturn_t wil6210_irq_misc(int
 	if (isr & ISR_MISC_FW_READY) {
 		wil_dbg_irq(wil, "IRQ: FW ready\n");
 		wil_cache_mbox_regs(wil);
-		set_bit(wil_status_mbox_ready, wil->status);
+		if (wil_validate_mbox_regs(wil))
+			set_bit(wil_status_mbox_ready, wil->status);
 		/**
 		 * Actual FW ready indicated by the
 		 * WMI_FW_READY_EVENTID
--- a/drivers/net/wireless/ath/wil6210/wmi.c
+++ b/drivers/net/wireless/ath/wil6210/wmi.c
@@ -209,7 +209,7 @@ static int __wmi_send(struct wil6210_pri
 	uint retry;
 	int rc = 0;
 
-	if (sizeof(cmd) + len > r->entry_size) {
+	if (len > r->entry_size - sizeof(cmd)) {
 		wil_err(wil, "WMI size too large: %d bytes, max is %d\n",
 			(int)(sizeof(cmd) + len), r->entry_size);
 		return -ERANGE;