#163 detected memory leaks in openbsd_reallocarray giflib/openbsd-reallocarray.c

[Chaitra Niddodi]

detected memory leaks in openbsd_reallocarray giflib/openbsd-reallocarray.c

Built from git commit hash adf5a1a
OS: Ubuntu 20.04
Compiler: clang version 11.0

Build options:

• Shared library disabled
  CC=clang
  CXX=clang++
  CFLAGS="-g -fno-inline -fsanitize=address"
  CXXFLAGS="-g -fno-inline -fsanitize=address"
  LDFLAGS="$LDFLAGS -fsanitize=address"
  ASAN_OPTIONS=abort_on_error=1

Command: ./gifsponge < pov

POV file: attached as pov.zip

Stack trace:

==3368562==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 112 byte(s) in 1 object(s) allocated from:
#0 0x4c17a8 in realloc /home/chaitra/aflgo-top/build/llvm_tools/llvm-11.0.0.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:164:3
#1 0x50fd94 in openbsd_reallocarray giflib/openbsd-reallocarray.c:73:9
#2 0x50ece4 in GifMakeSavedImage giflib/gifalloc.c:331:52
#3 0x4f70e0 in main giflib/gifsponge.c:68:9
#4 0x7f94abc5b082 in __libc_start_main /build/glibc-SzIz7B/glibc-2.31/csu/../csu/libc-start.c:308:16
Indirect leak of 48 byte(s) in 2 object(s) allocated from:
#0 0x4c142f in malloc /home/chaitra/aflgo-top/build/llvm_tools/llvm-11.0.0.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:145:3
#1 0x50ce51 in GifMakeMapObject giflib/gifalloc.c:53:32
#2 0x50eff7 in GifMakeSavedImage giflib/gifalloc.c:353:42
#3 0x4f70e0 in main giflib/gifsponge.c:68:9
#4 0x7f94abc5b082 in __libc_start_main /build/glibc-SzIz7B/glibc-2.31/csu/../csu/libc-start.c:308:16
Indirect leak of 12 byte(s) in 2 object(s) allocated from:
#0 0x4c15e7 in calloc /home/chaitra/aflgo-top/build/llvm_tools/llvm-11.0.0.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:154:3
#1 0x50ce82 in GifMakeMapObject giflib/gifalloc.c:58:38
#2 0x50eff7 in GifMakeSavedImage giflib/gifalloc.c:353:42
#3 0x4f70e0 in main giflib/gifsponge.c:68:9
#4 0x7f94abc5b082 in __libc_start_main /build/glibc-SzIz7B/glibc-2.31/csu/../csu/libc-start.c:308:16
Indirect leak of 6 byte(s) in 2 object(s) allocated from:
#0 0x4c17a8 in realloc /home/chaitra/aflgo-top/build/llvm_tools/llvm-11.0.0.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:164:3
#1 0x50fd94 in openbsd_reallocarray giflib/openbsd-reallocarray.c:73:9
#2 0x50f18e in GifMakeSavedImage giflib/gifalloc.c:363:47
#3 0x4f70e0 in main giflib/gifsponge.c:68:9
#4 0x7f94abc5b082 in __libc_start_main /build/glibc-SzIz7B/glibc-2.31/csu/../csu/libc-start.c:308:16
SUMMARY: AddressSanitizer: 178 byte(s) leaked in 7 allocation(s).

[Eric S. Raymond]

I can't fix this. Your memory leak is going to be inside the system realloc function, which my code is a trivial wrapper around.