GabrielTofvesson/CMath
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Fixed minor UAF bug. Added makefile

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This commit is contained in:
Gabriel Tofvesson 2018-11-25 22:06:11 +01:00
parent 14104ebb54
commit 1173e390cc
3 changed files with 20 additions and 3 deletions
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2
.gitignore vendored
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@ -53,3 +53,5 @@ dkms.conf
# Output build artifacts
bin/
test.c
mathtest

13
Makefile Normal file
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@ -0,0 +1,13 @@
clean:
rm -f $(wildcard *.o)
rm -f $(wildcard *.so)
build: varint.c
gcc -Wall -c -O3 -fPIC varint.c
gcc -o libCMath.so -shared varint.o
rebuild: clean build
test: test.c clean build
rm -f a.out
gcc -Wall -o mathtest -L$(shell pwd) test.c -lCMath
./mathtest

8
varint.c
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@ -47,12 +47,14 @@ unsigned long long varint_decode(varint varint){
return header;
}
if(header <= 248){
free(varint);
return 240UL + ((header - 241) << 8) + (unsigned char)varint[1];
unsigned long long result = 240UL + ((header - 241) << 8) + (unsigned char)varint[1];
free(varint);
return result;
}
if(header == 249){
unsigned long long result = 2288UL + ((unsigned char)varint[1] << 8) + (unsigned char)varint[2];
free(varint);
return 2288UL + ((unsigned char)varint[1] << 8) + (unsigned char)varint[2];
return result;
}
unsigned long result = (unsigned char)varint[1] | ((unsigned char)varint[2] << 8) | ((unsigned char)varint[3]);
int compare = 2;