tests: cover the code parsing comments
It seems to be failing with ``` AddressSanitizer:DEADLYSIGNAL ================================================================= ==13==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x00000055f428 bp 0x7ffc3743a170 sp 0x7ffc3743a080 T0) ==13==The signal is caused by a WRITE memory access. ==13==Hint: address points to the zero page. SCARINESS: 10 (null-deref) #0 0x55f428 in mnt_table_parse_next /src/util-linux/libmount/src/tab_parse.c:587:6 #1 0x55c200 in __table_parse_stream /src/util-linux/libmount/src/tab_parse.c:737:8 #2 0x55be38 in mnt_table_parse_stream /src/util-linux/libmount/src/tab_parse.c:809:8 #3 0x5511ff in LLVMFuzzerTestOneInput /src/util-linux/libmount/src/fuzz.c:21:16 #4 0x458a31 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:558:15 #5 0x458175 in fuzzer::Fuzzer::RunOne(unsigned char const*, unsigned long, bool, fuzzer::InputInfo*, bool*) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:470:3 #6 0x45a117 in fuzzer::Fuzzer::ReadAndExecuteSeedCorpora(std::__Fuzzer::vector<fuzzer::SizedFile, fuzzer::fuzzer_allocator<fuzzer::SizedFile> >&) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:770:7 #7 0x45a319 in fuzzer::Fuzzer::Loop(std::__Fuzzer::vector<fuzzer::SizedFile, fuzzer::fuzzer_allocator<fuzzer::SizedFile> >&) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:799:3 #8 0x44a055 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:846:6 #9 0x471bf2 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:19:10 #10 0x7fe3bd93b83f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2083f) #11 0x41f208 in _start (/out/test_mount_fuzz+0x41f208) DEDUP_TOKEN: mnt_table_parse_next--__table_parse_stream--mnt_table_parse_stream ```
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@ -17,6 +17,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
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f = fmemopen((char*) data, size, "re");
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assert(f);
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mnt_table_enable_comments(tb, TRUE);
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(void) mnt_table_parse_stream(tb, f, "mountinfo");
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mnt_unref_table(tb);
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