From: Oliver Neukum oneukum@suse.com
mainline inclusion from mainline-v5.17-rc4 commit e9da0b56fe27206b49f39805f7dcda8a89379062 category: bugfix bugzilla: 186472, https://gitee.com/src-openeuler/kernel/issues/I4ZQIZ CVE: CVE-2022-26966
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A malicious device can leak heap data to user space providing bogus frame lengths. Introduce a sanity check.
Signed-off-by: Oliver Neukum oneukum@suse.com Reviewed-by: Grant Grundler grundler@chromium.org Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com Reviewed-by: Yue Haibing yuehaibing@huawei.com Reviewed-by: Weilong Chen chenweilong@huawei.com --- drivers/net/usb/sr9700.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/usb/sr9700.c b/drivers/net/usb/sr9700.c index e04c8054c2cf..fce6713e970b 100644 --- a/drivers/net/usb/sr9700.c +++ b/drivers/net/usb/sr9700.c @@ -410,7 +410,7 @@ static int sr9700_rx_fixup(struct usbnet *dev, struct sk_buff *skb) /* ignore the CRC length */ len = (skb->data[1] | (skb->data[2] << 8)) - 4;
- if (len > ETH_FRAME_LEN) + if (len > ETH_FRAME_LEN || len > skb->len) return 0;
/* the last packet of current skb */