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[bug] Fix FSE_readNCount()

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* Fix bug introduced in PR #2271
* Fix long-standing bug that is impossible to trigger inside of zstd
* Add a fuzzer that makes sure the normalized count always round trips
  correctly
This commit is contained in:
Nick Terrell
2020-08-25 15:42:41 -07:00
parent 614e446000
commit 4193638996
4 changed files with 120 additions and 10 deletions
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tests/fuzz/Makefile
+5 -1
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@@ -96,7 +96,8 @@ FUZZ_TARGETS := \
dictionary_loader \
raw_dictionary_round_trip \
dictionary_stream_round_trip \
decompress_dstSize_tooSmall
decompress_dstSize_tooSmall \
fse_read_ncount
all: $(FUZZ_TARGETS)
@@ -184,6 +185,9 @@ dictionary_loader: $(FUZZ_HEADERS) $(FUZZ_ROUND_TRIP_OBJ) rt_fuzz_dictionary_loa
decompress_dstSize_tooSmall: $(FUZZ_HEADERS) $(FUZZ_DECOMPRESS_OBJ) d_fuzz_decompress_dstSize_tooSmall.o
$(CXX) $(FUZZ_TARGET_FLAGS) $(FUZZ_DECOMPRESS_OBJ) d_fuzz_decompress_dstSize_tooSmall.o $(LIB_FUZZING_ENGINE) -o $@
fse_read_ncount: $(FUZZ_HEADERS) $(FUZZ_ROUND_TRIP_OBJ) rt_fuzz_fse_read_ncount.o
$(CXX) $(FUZZ_TARGET_FLAGS) $(FUZZ_ROUND_TRIP_OBJ) rt_fuzz_fse_read_ncount.o $(LIB_FUZZING_ENGINE) -o $@
libregression.a: $(FUZZ_HEADERS) $(PRGDIR)/util.h $(PRGDIR)/util.c d_fuzz_regression_driver.o
$(AR) $(FUZZ_ARFLAGS) $@ d_fuzz_regression_driver.o