In case one of the allocations fails.
For example:
AddressSanitizer:DEADLYSIGNAL
=================================================================
==17==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7fb352a476e5 bp 0x7ffe45154850 sp 0x7ffe45154008 T0)
==17==The signal is caused by a READ memory access.
==17==Hint: address points to the zero page.
SCARINESS: 10 (null-deref)
#0 0x7fb352a476e5 (/lib/x86_64-linux-gnu/libc.so.6+0x1886e5) (BuildId: 1878e6b475720c7c51969e69ab2d276fae6d1dee)
#1 0x435878 in __interceptor_strlen /src/llvm-project/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc
#2 0x4de1e4 in LLVMFuzzerTestOneInput /work/build/../../src/systemd/src/fuzz/fuzz-calendarspec.c:20:21
#3 0x4deea8 in NaloFuzzerTestOneInput (/build/fuzz-calendarspec+0x4deea8)
#4 0x4fde33 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:611:15
#5 0x4fd61a in fuzzer::Fuzzer::RunOne(unsigned char const*, unsigned long, bool, fuzzer::InputInfo*, bool, bool*) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:514:3
#6 0x4fece9 in fuzzer::Fuzzer::MutateAndTestOne() /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:757:19
#7 0x4ff9b5 in fuzzer::Fuzzer::Loop(std::__Fuzzer::vector<fuzzer::SizedFile, std::__Fuzzer::allocator<fuzzer::SizedFile> >&) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:895:5
#8 0x4eed1f in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:912:6
#9 0x4ef5e8 in LLVMFuzzerRunDriver /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:925:10
#10 0x4df105 in main (/build/fuzz-calendarspec+0x4df105)
#11 0x7fb3528e3082 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24082) (BuildId: 1878e6b475720c7c51969e69ab2d276fae6d1dee)
#12 0x41f80d in _start (/build/fuzz-calendarspec+0x41f80d)
Found by Nallocfuzz.
Frantisek Sumsal
5b6f7b104c