Stack-overflow in cil_compile

```
#0  UnwindImpl () at /src/llvm-project/compiler-rt/lib/asan/asan_stack.cpp:63
#1  0x000000000052310d in Unwind () at /src/llvm-project/compiler-rt/lib/asan/../sanitizer_common/sanitizer_stacktrace.h:120
#2  __interceptor_malloc () at /src/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:145
#3  0x00000000005cec89 in cil_malloc () at ../cil/src/cil_mem.c:39
#4  0x00000000005cd75b in cil_list_item_init () at ../cil/src/cil_list.c:81
#5  0x00000000005cd8b4 in cil_list_append () at ../cil/src/cil_list.c:106
#6  0x00000000005a52c4 in __cil_fill_expr () at ../cil/src/cil_build_ast.c:2604
#7  0x00000000005a5511 in __cil_fill_expr_helper () at ../cil/src/cil_build_ast.c:2580
#8  0x00000000005a51e1 in __cil_fill_expr () at ../cil/src/cil_build_ast.c:2608
#9  0x00000000005a5511 in __cil_fill_expr_helper () at ../cil/src/cil_build_ast.c:2580
(More stack frames follow...)
#58643 0x0000000000608642 in cil_tree_walk () at ../cil/src/cil_tree.c:316
#58644 0x000000000060841a in cil_tree_walk_core () at ../cil/src/cil_tree.c:284
#58645 0x0000000000608642 in cil_tree_walk () at ../cil/src/cil_tree.c:316
#58646 0x00000000005b9d3a in cil_build_ast () at ../cil/src/cil_build_ast.c:6587
#58647 0x000000000056d14c in cil_compile () at ../cil/src/cil.c:565
#58648 0x0000000000556fc5 in LLVMFuzzerTestOneInput () at /src/secilc-fuzzer.c:59
#58649 0x000000000045be94 in ExecuteCallback () at /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:599
#58650 0x0000000000447603 in RunOneTest () at /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:323
#58651 0x000000000044d2cf in FuzzerDriver () at /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:856
#58652 0x0000000000476d83 in main () at /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20
```

src-openEuler/libsepol

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