CVE-2022-28733

Integer underflow in grub_net_recv_ip4_packets; A malicious crafted IP
packet can lead to an integer underflow in grub_net_recv_ip4_packets()
function on rsm->total_len value. Under certain circumstances the total_len
value may end up wrapping around to a small integer number which will be
used in memory allocation. If the attack succeeds in such way, subsequent
operations can write past the end of the buffer.

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