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38a09b7402
OSS-Fuzz found a NULL pointer dereference when the CIL compiler tries to
compile a policy where a categoryalias references an unused
categoryalias:
$ echo '(categoryalias c0)(categoryalias c1)(categoryaliasactual c0 c1)' > tmp.cil
$ secil tmp.cil
Segmentation fault (core dumped)
In such a case, a1 can become NULL in cil_resolve_alias_to_actual().
Add a check to report an error when this occurs. Now the error message
is:
Alias c0 references an unused alias c1 at tmp.cil:1
Fixes: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28471
Signed-off-by: Nicolas Iooss <nicolas.iooss@m4x.org>
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