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e2d018423d
OSS-Fuzz found a Null-dereference READ in the CIL compiler when trying
to compile the following policy:
(optional o (validatetrans x (eq t3 (a ()))))
With some logs, secilc reports:
Invalid syntax
Destroying Parse Tree
Resolving AST
Failed to resolve validatetrans statement at fuzz:1
Disabling optional 'o' at tmp.cil:1
So there is an "Invalid syntax" error, but the compilation continues.
Fix this issue by stopping the compilation when cil_fill_list() reports
an error:
Invalid syntax
Bad expression tree for constraint
Bad validatetrans declaration at tmp.cil:1
Fixes: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=29061
Signed-off-by: Nicolas Iooss <nicolas.iooss@m4x.org>
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