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6ebbc8fcdc
If we fail to combine the new entry with a previous one, or update it in
the hashmap, we might later on attempt a double-free:
=================================================================
==10==ERROR: AddressSanitizer: attempting double-free on 0x611000039fc0 in thread T0:
SCARINESS: 42 (double-free)
#0 0x4a0962 in __interceptor_free /src/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:52:3
#1 0x7f55e431d9f2 in _hashmap_clear /work/build/../../src/systemd/src/basic/hashmap.c:927:33
#2 0x7f55e431d4c8 in _hashmap_free /work/build/../../src/systemd/src/basic/hashmap.c:896:17
#3 0x4de1de in ordered_hashmap_free_free_free /work/build/../../src/systemd/src/basic/hashmap.h:120:24
#4 0x4de1de in ordered_hashmap_free_free_freep /work/build/../../src/systemd/src/basic/hashmap.h:434:1
#5 0x4de1de in LLVMFuzzerTestOneInput /work/build/../../src/systemd/src/fuzz/fuzz-catalog.c:26:1
#6 0x4de8b8 in NaloFuzzerTestOneInput (/build/fuzz-catalog+0x4de8b8)
#7 0x4fd8c3 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:611:15
#8 0x4fd0aa 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
#9 0x4fe779 in fuzzer::Fuzzer::MutateAndTestOne() /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:757:19
#10 0x4ff445 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
#11 0x4ee7af in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:912:6
#12 0x4ef078 in LLVMFuzzerRunDriver /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:925:10
#13 0x4deb35 in main (/build/fuzz-catalog+0x4deb35)
#14 0x7f55e3a32082 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24082) (BuildId: 1878e6b475720c7c51969e69ab2d276fae6d1dee)
#15 0x41f7cd in _start (/build/fuzz-catalog+0x41f7cd)
DEDUP_TOKEN: __interceptor_free--_hashmap_clear--_hashmap_free
0x611000039fc0 is located 0 bytes inside of 224-byte region [0x611000039fc0,0x61100003a0a0)
freed by thread T0 here:
#0 0x4a0962 in __interceptor_free /src/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:52:3
#1 0x7f55e451493d in freep /work/build/../../src/systemd/src/basic/alloc-util.h:107:22
#2 0x7f55e451493d in finish_item /work/build/../../src/systemd/src/libsystemd/sd-journal/catalog.c:187:1
#3 0x7f55e4513e56 in catalog_import_file /work/build/../../src/systemd/src/libsystemd/sd-journal/catalog.c:313:45
#4 0x4de1be in LLVMFuzzerTestOneInput /work/build/../../src/systemd/src/fuzz/fuzz-catalog.c:23:16
#5 0x4de8b8 in NaloFuzzerTestOneInput (/build/fuzz-catalog+0x4de8b8)
#6 0x4fd8c3 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:611:15
#7 0x4fd0aa 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
#8 0x4fe779 in fuzzer::Fuzzer::MutateAndTestOne() /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:757:19
#9 0x4ff445 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
#10 0x4ee7af in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:912:6
#11 0x4ef078 in LLVMFuzzerRunDriver /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:925:10
#12 0x4deb35 in main (/build/fuzz-catalog+0x4deb35)
#13 0x7f55e3a32082 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24082) (BuildId: 1878e6b475720c7c51969e69ab2d276fae6d1dee)
DEDUP_TOKEN: __interceptor_free--freep--finish_item
previously allocated by thread T0 here:
#0 0x4a0c06 in __interceptor_malloc /src/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:69:3
#1 0x4de539 in malloc (/build/fuzz-catalog+0x4de539)
#2 0x7f55e42bf96b in memdup /work/build/../../src/systemd/src/basic/alloc-util.c:16:15
#3 0x7f55e451475d in finish_item /work/build/../../src/systemd/src/libsystemd/sd-journal/catalog.c:176:28
#4 0x7f55e4513e56 in catalog_import_file /work/build/../../src/systemd/src/libsystemd/sd-journal/catalog.c:313:45
#5 0x4de1be in LLVMFuzzerTestOneInput /work/build/../../src/systemd/src/fuzz/fuzz-catalog.c:23:16
#6 0x4de8b8 in NaloFuzzerTestOneInput (/build/fuzz-catalog+0x4de8b8)
#7 0x4fd8c3 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:611:15
#8 0x4fd0aa 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
#9 0x4fe779 in fuzzer::Fuzzer::MutateAndTestOne() /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:757:19
#10 0x4ff445 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
#11 0x4ee7af in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:912:6
#12 0x4ef078 in LLVMFuzzerRunDriver /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:925:10
#13 0x4deb35 in main (/build/fuzz-catalog+0x4deb35)
#14 0x7f55e3a32082 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24082) (BuildId: 1878e6b475720c7c51969e69ab2d276fae6d1dee)
DEDUP_TOKEN: __interceptor_malloc--malloc--memdup
SUMMARY: AddressSanitizer: double-free /src/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:52:3 in __interceptor_free
Found by Nallocfuzz.
(cherry picked from commit ac874b8fb13bf293986a3814149a820729b27a30)
(cherry picked from commit b1663b83338dc335e86eda05e28f229f25bdfa48)
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