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net/tstun: fix gvisor inbound GSO packet injection (#13283)

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buffs[0] was not sized to hold pkt with GSO, resulting in a panic.

Updates tailscale/corp#22511

Signed-off-by: Jordan Whited <jordan@tailscale.com>
This commit is contained in:
Jordan Whited
2024-08-27 14:59:43 -07:00
committed by GitHub
parent a2c42d3cd4
commit 31cdbd68b1
2 changed files with 9 additions and 4 deletions
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4
net/tstun/wrap.go
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@@ -1258,8 +1258,8 @@ func (t *Wrapper) SetJailedFilter(filt *filter.Filter) {
//
// pkt will be copied into buffs before writing to the underlying tun.Device.
// Therefore, callers must allocate and pass a buffs slice that is sized
// appropriately for holding pkt.Size() + PacketStartOffset as either a single
// element (buffs[0]), or split across multiple elements if the originating
// appropriately for holding pkt.Size() + PacketStartOffset as a single
// element (buffs[0]) and split across multiple elements if the originating
// stack supports GSO. sizes must be sized with similar consideration,
// len(buffs) should be equal to len(sizes). If any len(buffs[<index>]) was
// mutated by InjectInboundPacketBuffer it will be reset to cap(buffs[<index>])