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ipsec: Validate the protocol identifier in ipsec4_ctlinput()
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Authored by markj on Sep 9 2021, 5:11 PM.
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Details

Summary

key_allocsa() expects to handle only IPSec protocols and has an
assertion to this effect. However, ipsec4_ctlinput() has to handle
messages from ICMP unreachable packets and was not validating the
protocol number. In practice I believe such a packet would simply fail
to match any SADB entries and would thus be ignored.

Reported by: syzbot+6a9ef6fcfadb9f3877fe@syzkaller.appspotmail.com

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