2bd82070ef
cil_tree_print_expr() calls cil_expr_to_string() in order to compute a
string expression into expr_str. If this function fails, expr_str is
left unitialized but its value is dereferenced with:
cil_log(CIL_INFO, "%s)", expr_str);
Prevent such an issue by checking cil_expr_to_string()'s return value
before using expr_str.
This issue has been found with clang's static analyzer.
Signed-off-by: Nicolas Iooss <nicolas.iooss@m4x.org>
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