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c5e6153720
OSS-Fuzz found a Null-dereference in __cil_insert_name when trying to
compile the following policy:
(macro MACRO ()
(classmap CLASS (PERM))
(type TYPE)
(typetransition TYPE TYPE CLASS "name" TYPE)
)
(call MACRO)
When using a macro with no argument, macro->params is NULL and
cil_list_for_each(item, macro->params) dereferenced a NULL pointer.
Fix this by checking that macro->params is not NULL before using it.
Fixes: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28565
Signed-off-by: Nicolas Iooss <nicolas.iooss@m4x.org>
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