https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114827
--- Comment #6 from Neil Carlson <neil.n.carlson at gmail dot com> ---
Here's a variation of the example involving arrays. I expect the source of the
failure here is the same, but I want to be sure this example is also fixed by
the eventual patch.
program main
call run
contains
subroutine run
class(*), allocatable :: y(:)
call foo(['fubar','fubar'], y)
end subroutine
subroutine foo(a, b)
class(*), intent(in) :: a(:)
class(*), allocatable :: b(:)
b = a
!allocate(b, source=a) ! VALGRIND REPORTS NO INVALID WRITES
end subroutine
end program
Compiled with -fsanitize=address and executed gives this:
==1338704==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x602000000072 at pc 0x7fb456a4c8d1 bp 0x7ffcfd375d50 sp 0x7ffcfd375500
WRITE of size 5 at 0x602000000072 thread T0
#0 0x7fb456a4c8d0 in __interceptor_memmove
../../../../libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:810
#1 0x4012d4 in __copy_character_1 /home/nnc/Codes/petaca/bugs/fubar.f90:1
#2 0x401c9f in foo /home/nnc/Codes/petaca/bugs/fubar.f90:11
#3 0x4023e8 in run /home/nnc/Codes/petaca/bugs/fubar.f90:6
#4 0x40137e in MAIN__ /home/nnc/Codes/petaca/bugs/fubar.f90:2
#5 0x4027a1 in main /home/nnc/Codes/petaca/bugs/fubar.f90:2
#6 0x7fb4563ff149 in __libc_start_call_main (/lib64/libc.so.6+0x28149)
#7 0x7fb4563ff20a in __libc_start_main_impl (/lib64/libc.so.6+0x2820a)
#8 0x401184 in _start (/home/nnc/Codes/petaca/bugs/a.out+0x401184)
0x602000000072 is located 0 bytes to the right of 2-byte region
[0x602000000070,0x602000000072)
allocated by thread T0 here:
#0 0x7fb456abd69f in __interceptor_malloc
../../../../libsanitizer/asan/asan_malloc_linux.cpp:69
#1 0x401965 in foo /home/nnc/Codes/petaca/bugs/fubar.f90:11
#2 0x4023e8 in run /home/nnc/Codes/petaca/bugs/fubar.f90:6
#3 0x40137e in MAIN__ /home/nnc/Codes/petaca/bugs/fubar.f90:2
#4 0x4027a1 in main /home/nnc/Codes/petaca/bugs/fubar.f90:2
#5 0x7fb4563ff149 in __libc_start_call_main (/lib64/libc.so.6+0x28149)
#6 0x7fb4563ff20a in __libc_start_main_impl (/lib64/libc.so.6+0x2820a)
#7 0x401184 in _start (/home/nnc/Codes/petaca/bugs/a.out+0x401184)
SUMMARY: AddressSanitizer: heap-buffer-overflow
../../../../libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:810
in __interceptor_memmove
