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From: "vmjuan90 at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c/99269] New: False positive -Wanalyzer-malloc-leak/-Wanalyzer-double-free with -fanalyzer Date: Thu, 25 Feb 2021 13:55:44 +0000 [thread overview] Message-ID: <bug-99269-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99269 Bug ID: 99269 Summary: False positive -Wanalyzer-malloc-leak/-Wanalyzer-double-free with -fanalyzer Product: gcc Version: 10.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: vmjuan90 at gmail dot com Target Milestone: --- Created attachment 50255 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50255&action=edit minimun example for reproduce Hello I added the minimun example file (bug.c) and the gcc command line for reproduce what i think are 2 false positives from -fanalizer $ gcc -v -save-temps -fanalyzer -c bug.c Usando especificaciones internas. COLLECT_GCC=gcc Objetivo: x86_64-pc-linux-gnu Configurado con: /var/tmp/portage/sys-devel/gcc-10.2.0-r5/work/gcc-10.2.0/configure --host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr --bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/10.2.0 --includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/include --datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/10.2.0 --mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/10.2.0/man --infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/10.2.0/info --with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/include/g++-v10 --with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/10.2.0/python --enable-languages=c,c++,fortran --enable-obsolete --enable-secureplt --disable-werror --with-system-zlib --enable-nls --without-included-gettext --enable-checking=release --with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo 10.2.0-r5 p6' --disable-esp --enable-libstdcxx-time --with-build-config=bootstrap-lto --enable-shared --enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu --enable-multilib --with-multilib-list=m32,m64 --disable-fixed-point --enable-targets=all --enable-libgomp --disable-libssp --disable-libada --disable-systemtap --enable-vtable-verify --without-zstd --enable-lto --with-isl --disable-isl-version-check --enable-default-pie --enable-default-ssp Modelo de hilos: posix Algoritmos de compresión LTO admitidos: zlib gcc versión 10.2.0 (Gentoo 10.2.0-r5 p6) COLLECT_GCC_OPTIONS='-v' '-save-temps' '-fanalyzer' '-c' '-mtune=generic' '-march=x86-64' /usr/libexec/gcc/x86_64-pc-linux-gnu/10.2.0/cc1 -E -quiet -v bug.c -mtune=generic -march=x86-64 -fanalyzer -fpch-preprocess -o bug.i se descarta el directorio inexistente "/usr/local/include" se descarta el directorio inexistente "/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../x86_64-pc-linux-gnu/include" la búsqueda de #include "..." inicia aquí: la búsqueda de #include <...> inicia aquí: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/include /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/include-fixed /usr/include Fin de la lista de búsqueda. COLLECT_GCC_OPTIONS='-v' '-save-temps' '-fanalyzer' '-c' '-mtune=generic' '-march=x86-64' /usr/libexec/gcc/x86_64-pc-linux-gnu/10.2.0/cc1 -fpreprocessed bug.i -quiet -dumpbase bug.c -mtune=generic -march=x86-64 -auxbase bug -version -fanalyzer -o bug.s GNU C17 (Gentoo 10.2.0-r5 p6) versión 10.2.0 (x86_64-pc-linux-gnu) compilado por GNU C versión 10.2.0, GMP versión 6.2.1, MPFR versión 4.1.0, MPC versión 1.2.1, isl versión isl-0.23-GMP GGC heurísticas: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 GNU C17 (Gentoo 10.2.0-r5 p6) versión 10.2.0 (x86_64-pc-linux-gnu) compilado por GNU C versión 10.2.0, GMP versión 6.2.1, MPFR versión 4.1.0, MPC versión 1.2.1, isl versión isl-0.23-GMP GGC heurísticas: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 Compiler executable checksum: 5fe470a537c6a646ee2db89927c9a5b2 En la función ‘example’: bug.c:11:10: aviso: leak of ‘<desconocido>’ [CWE-401] [-Wanalyzer-malloc-leak] 11 | namelist[1] = malloc(sizeof **namelist); | ^ ‘example’: events 1-6 | | 9 | if (!namelist) return; | | ^ | | | | | (1) following ‘false’ branch (when ‘namelist’ is non-NULL)... | 10 | namelist[0] = malloc(sizeof **namelist); | | ~~~~~~~~~~~~~~~~~~~~~~~~~ | | | | | (2) ...to here | | (3) allocated here | 11 | namelist[1] = malloc(sizeof **namelist); | | ~ | | | | | (6) ‘<desconocido>’ leaks here; was allocated at (3) | 12 | | 13 | while(len--) { free(namelist[len]); } | | ~ ~ | | | | | | | (5) ...to here | | (4) following ‘true’ branch... | bug.c:13:17: aviso: double-‘free’ of ‘<desconocido>’ [CWE-415] [-Wanalyzer-double-free] 13 | while(len--) { free(namelist[len]); } | ^~~~~~~~~~~~~~~~~~~ ‘example’: events 1-11 | | 9 | if (!namelist) return; | | ^ | | | | | (1) following ‘false’ branch (when ‘namelist’ is non-NULL)... | 10 | namelist[0] = malloc(sizeof **namelist); | | ~~~~~~~~~~~~~~~~~~~~~~~~~ | | | | | (2) ...to here |...... | 13 | while(len--) { free(namelist[len]); } | | ~ ~~~~~~~~~~~~~~~~~~~ | | | | | | | | | (4) ...to here | | | | (5) first ‘free’ here | | | | (7) ...to here | | | | (8) first ‘free’ here | | | | (10) ...to here | | | (11) second ‘free’ here; first ‘free’ was at (8) | | (3) following ‘true’ branch... | | (6) following ‘true’ branch... | | (9) following ‘true’ branch... | COLLECT_GCC_OPTIONS='-v' '-save-temps' '-fanalyzer' '-c' '-mtune=generic' '-march=x86-64' /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../x86_64-pc-linux-gnu/bin/as -v --64 -o bug.o bug.s GNU ensamblador versión 2.34.0 (x86_64-pc-linux-gnu) utilizando BFD versión (Gentoo 2.34 p6) 2.34.0 COMPILER_PATH=/usr/libexec/gcc/x86_64-pc-linux-gnu/10.2.0/:/usr/libexec/gcc/x86_64-pc-linux-gnu/10.2.0/:/usr/libexec/gcc/x86_64-pc-linux-gnu/:/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/:/usr/lib/gcc/x86_64-pc-linux-gnu/:/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../x86_64-pc-linux-gnu/bin/ LIBRARY_PATH=/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/:/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib64/:/lib/../lib64/:/usr/lib/../lib64/:/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../x86_64-pc-linux-gnu/lib/:/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../:/lib/:/usr/lib/ COLLECT_GCC_OPTIONS='-v' '-save-temps' '-fanalyzer' '-c' '-mtune=generic' '-march=x86-64' regards
next reply other threads:[~2021-02-25 13:55 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-02-25 13:55 vmjuan90 at gmail dot com [this message] 2021-11-13 0:33 ` [Bug analyzer/99269] " npfhrotynz-ptnqh.myvf at noclue dot notk.org 2021-11-30 19:41 ` dmalcolm at gcc dot gnu.org 2021-11-30 22:50 ` cvs-commit at gcc dot gnu.org 2021-11-30 22:54 ` dmalcolm at gcc dot gnu.org
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