https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102769
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
CC| |marxin at gcc dot gnu.org
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
I think it's invalid code:
gcc-11 pr102769.c -g -fsanitize=address,undefined && ./a.out
=================================================================
==27019==ERROR: AddressSanitizer: stack-use-after-scope on address
0x7fffffffdd00 at pc 0x000000400bfd bp 0x7fffffffdcd0 sp 0x7fffffffdcc8
READ of size 4 at 0x7fffffffdd00 thread T0
#0 0x400bfc in main /home/marxin/Programming/testcases/pr102769.c:5
#1 0x7ffff6a7553f in __libc_start_call_main
../sysdeps/nptl/libc_start_call_main.h:58
#2 0x7ffff6a755eb in __libc_start_main_impl ../csu/libc-start.c:409
#3 0x400a44 in _start (/home/marxin/Programming/testcases/a.out+0x400a44)
Address 0x7fffffffdd00 is located in stack of thread T0 at offset 32 in frame
#0 0x400b15 in main /home/marxin/Programming/testcases/pr102769.c:2
This frame has 2 object(s):
[32, 36) 'h' (line 7) <== Memory access at offset 32 is inside this
variable
[48, 128) 'g' (line 3)
HINT: this may be a false positive if your program uses some custom stack
unwind mechanism, swapcontext or vfork
(longjmp and C++ exceptions *are* supported)
SUMMARY: AddressSanitizer: stack-use-after-scope
/home/marxin/Programming/testcases/pr102769.c:5 in main
Shadow bytes around the buggy address:
0x10007fff7b50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10007fff7b60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10007fff7b70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10007fff7b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10007fff7b90: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
=>0x10007fff7ba0:[f8]f2 00 00 00 00 00 00 00 00 00 00 f3 f3 f3 f3
0x10007fff7bb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10007fff7bc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10007fff7bd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10007fff7be0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10007fff7bf0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
Shadow gap: cc
==27019==ABORTING
