From ee591f2b281721171896117f9946fced31441418 Mon Sep 17 00:00:00 2001 From: Foster Snowhill Date: Sun, 26 Jan 2025 00:54:08 +0100 Subject: [PATCH] usbnet: ipheth: fix DPE OoB read Fix an out-of-bounds DPE read, limit the number of processed DPEs to the amount that fits into the fixed-size NDP16 header. Fixes: a2d274c62e44 ("usbnet: ipheth: add CDC NCM support") Cc: stable@vger.kernel.org Signed-off-by: Foster Snowhill Reviewed-by: Jakub Kicinski Signed-off-by: Paolo Abeni --- drivers/net/usb/ipheth.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/net/usb/ipheth.c b/drivers/net/usb/ipheth.c index 03249208612e..5347cd7e295b 100644 --- a/drivers/net/usb/ipheth.c +++ b/drivers/net/usb/ipheth.c @@ -246,7 +246,7 @@ static int ipheth_rcvbulk_callback_ncm(struct urb *urb) goto rx_error; dpe = ncm0->dpe16; - while (true) { + for (int dpe_i = 0; dpe_i < IPHETH_NDP16_MAX_DPE; ++dpe_i, ++dpe) { dg_idx = le16_to_cpu(dpe->wDatagramIndex); dg_len = le16_to_cpu(dpe->wDatagramLength); @@ -268,8 +268,6 @@ static int ipheth_rcvbulk_callback_ncm(struct urb *urb) retval = ipheth_consume_skb(buf, dg_len, dev); if (retval != 0) return retval; - - dpe++; } rx_error: