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usbnet: ipheth: fix DPE OoB read

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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: a2d274c62e ("usbnet: ipheth: add CDC NCM support")
Cc: stable@vger.kernel.org
Signed-off-by: Foster Snowhill <forst@pen.gy>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Foster Snowhill 2025-01-26 00:54:08 +01:00 • committed by Paolo Abeni
parent efcbc678a1
commit ee591f2b28
1 changed files with 1 additions and 3 deletions
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4
drivers/net/usb/ipheth.c
View file

@ -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: