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Kernel: Actually, let's not hang() on bad incoming packets

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That kinda defeats the purpose of being smart enough to ignore them :^)
This commit is contained in:
Andreas Kling 2019-08-09 09:38:38 +02:00
parent 9e2a00248e
commit f9de264f88
1 changed files with 0 additions and 3 deletions
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3
Kernel/Net/NetworkTask.cpp
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@ -185,21 +185,18 @@ void handle_ipv4(const EthernetFrameHeader& eth, int frame_size)
constexpr int minimum_ipv4_frame_size = sizeof(EthernetFrameHeader) + sizeof(IPv4Packet); constexpr int minimum_ipv4_frame_size = sizeof(EthernetFrameHeader) + sizeof(IPv4Packet);
if (frame_size < minimum_ipv4_frame_size) { if (frame_size < minimum_ipv4_frame_size) {
kprintf("handle_ipv4: Frame too small (%d, need %d)\n", frame_size, minimum_ipv4_frame_size); kprintf("handle_ipv4: Frame too small (%d, need %d)\n", frame_size, minimum_ipv4_frame_size);
hang();
return; return;
} }
auto& packet = *static_cast<const IPv4Packet*>(eth.payload()); auto& packet = *static_cast<const IPv4Packet*>(eth.payload());
if (packet.length() < sizeof(IPv4Packet)) { if (packet.length() < sizeof(IPv4Packet)) {
kprintf("handle_ipv4: IPv4 packet too short (%u, need %u)\n", packet.length(), sizeof(IPv4Packet)); kprintf("handle_ipv4: IPv4 packet too short (%u, need %u)\n", packet.length(), sizeof(IPv4Packet));
hang();
return; return;
} }
size_t actual_ipv4_packet_length = frame_size - sizeof(EthernetFrameHeader); size_t actual_ipv4_packet_length = frame_size - sizeof(EthernetFrameHeader);
if (packet.length() > actual_ipv4_packet_length) { if (packet.length() > actual_ipv4_packet_length) {
kprintf("handle_ipv4: IPv4 packet claims to be longer than it is (%u, actually %zu)\n", packet.length(), actual_ipv4_packet_length); kprintf("handle_ipv4: IPv4 packet claims to be longer than it is (%u, actually %zu)\n", packet.length(), actual_ipv4_packet_length);
hang();
return; return;
} }