Joseph Sutton 2a4210b7e9 gsskrb5: CVE-2022-3437 Pass correct length to _gssapi_verify_pad() ...

We later subtract 8 when calculating the length of the output message
buffer. If padlength is excessively high, this calculation can underflow
and result in a very large positive value.

Now we properly constrain the value of padlength so underflow shouldn't
be possible.

Samba BUG: https://bugzilla.samba.org/show_bug.cgi?id=15134

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>

2022-11-15 17:51:45 -06:00

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