From: Len Baker <len.baker@gmx.com>
To: Yan-Hsuan Chuang <tony0620emma@gmail.com>,
Kalle Valo <kvalo@codeaurora.org>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>
Cc: Len Baker <len.baker@gmx.com>,
Stanislaw Gruszka <sgruszka@redhat.com>,
Brian Norris <briannorris@chromium.org>,
linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: [PATCH] rtw88: Fix out-of-bounds write
Date: Sun, 11 Jul 2021 16:16:34 +0200 [thread overview]
Message-ID: <20210711141634.6133-1-len.baker@gmx.com> (raw)
In the rtw_pci_init_rx_ring function the "if (len > TRX_BD_IDX_MASK)"
statement guarantees that len is less than or equal to GENMASK(11, 0) or
in other words that len is less than or equal to 4095. However the
rx_ring->buf has a size of RTK_MAX_RX_DESC_NUM (defined as 512). This
way it is possible an out-of-bounds write in the for statement due to
the i variable can exceed the rx_ring->buff size.
Fix it using the ARRAY_SIZE macro.
Cc: stable@vger.kernel.org
Addresses-Coverity-ID: 1461515 ("Out-of-bounds write")
Fixes: e3037485c68ec ("rtw88: new Realtek 802.11ac driver")
Signed-off-by: Len Baker <len.baker@gmx.com>
---
drivers/net/wireless/realtek/rtw88/pci.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/wireless/realtek/rtw88/pci.c b/drivers/net/wireless/realtek/rtw88/pci.c
index e7d17ab8f113..b9d8c049e776 100644
--- a/drivers/net/wireless/realtek/rtw88/pci.c
+++ b/drivers/net/wireless/realtek/rtw88/pci.c
@@ -280,7 +280,7 @@ static int rtw_pci_init_rx_ring(struct rtw_dev *rtwdev,
}
rx_ring->r.head = head;
- for (i = 0; i < len; i++) {
+ for (i = 0; i < ARRAY_SIZE(rx_ring->buf); i++) {
skb = dev_alloc_skb(buf_sz);
if (!skb) {
allocated = i;
--
2.25.1
next reply other threads:[~2021-07-11 14:17 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-11 14:16 Len Baker [this message]
2021-07-12 1:43 ` Pkshih
2021-07-12 18:38 ` Brian Norris
2021-07-16 15:08 ` Len Baker
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