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From: "shaohua.li at inf dot ethz.ch" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug sanitizer/108023] New: Incorrect line number in ASAN's report
Date: Thu, 08 Dec 2022 15:11:28 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: sanitizer
X-Bugzilla-Version: 13.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108023

            Bug ID: 108023
           Summary: Incorrect line number in ASAN's report
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: sanitizer
          Assignee: unassigned at gcc dot gnu.org
          Reporter: shaohua.li at inf dot ethz.ch
                CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
                    jakub at gcc dot gnu.org, kcc at gcc dot gnu.org, marxi=
n at gcc dot gnu.org
  Target Milestone: ---

For the following code, GCC's ASAN at -O1 and above produce incorrect line
numbers in the final reports (Line 15 v.s. Line 8).

Compiler explorer: https://godbolt.org/z/4953EPr78

% cat a.c
int a, b, c, g, f;

static long d(int);

long d(int h) {
  int **j =3D (int**)malloc(sizeof(int *) * sizeof(int));
  for (int i =3D 0; i < sizeof(int); i++)
    j[i] =3D malloc(sizeof(f));

  int *k =3D malloc(sizeof(int) * sizeof(g));

  for (h=3D0; h <=3D 2; h++) {
    free(k);
    for (b=3D0; b <=3D 2; b++)
      k[3] =3D j[0][h];
  }
  return k[a];
}

void e() {=20
    c =3D d(0);=20
}

int main() {=20
    e();=20=20
    return c;
}
%
% gcc-tk -O0 -fsanitize=3Daddress -w -g a.c && ./a.out
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D3175968=3D=3DERROR: AddressSanitizer: heap-use-after-free on address
0x60200000009c at pc 0x00000040130f bp 0x7ffd47fc9fd0 sp 0x7ffd47fc9fc8
WRITE of size 4 at 0x60200000009c thread T0
    #0 0x40130e in d /a.c:15
    #1 0x4013a3 in e /a.c:21
    #2 0x4013ba in main /a.c:25
...
%
%  gcc-tk -O2 -fsanitize=3Daddress -w -g a.c && ./a.out
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D3254785=3D=3DERROR: AddressSanitizer: heap-use-after-free on address
0x60200000009c at pc 0x000000401354 bp 0x7ffce8fa2e80 sp 0x7ffce8fa2e78
WRITE of size 4 at 0x60200000009c thread T0
    #0 0x401353 in d /a.c:8
    #1 0x4010e8 in e /a.c:21
    #2 0x4010e8 in main /a.c:25
...
%=