[Bug sanitizer/115155] New: [11/12 Regression] signed integer overflow check missing

[bic60176 at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115155

            Bug ID: 115155
           Summary: [11/12 Regression] signed integer overflow check
                    missing
           Product: gcc
           Version: 12.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: sanitizer
          Assignee: unassigned at gcc dot gnu.org
          Reporter: bic60176 at gmail dot com
                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
  Target Milestone: ---

Created attachment 58243
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=58243&action=edit
testcase

OS: Ubuntu 22.04.3 LTS

UBSAN missed checking signed integer overflow when compiling with gcc-11.4.0,
gcc-12.3.0.

$../compiler-builds/gcc-13.2.0_build/bin/gcc -fsanitize=undefined -g -lgcc_s
-O0 testcase.c -o exec

$ ./exec 2>exec.err

$ cat exec.err
testcase.c:5:16: runtime error: signed integer overflow: 48344 * 65535 cannot
be represented in type 'int'

$../compiler-builds/gcc-12.3.0_build/bin/gcc -fsanitize=undefined -g -lgcc_s
-O0 testcase.c -o exec

$ ./exec 2>exec.err

$ cat exec.err