[llvm-bugs] [Bug 52385] New: UBSAN in ./compiler-rt/lib/asan/asan_allocator.cpp

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=52385

            Bug ID: 52385
           Summary: UBSAN in ./compiler-rt/lib/asan/asan_allocator.cpp
           Product: compiler-rt
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: asan
          Assignee: unassignedbugs at nondot.org
          Reporter: mliska at suse.cz
                CC: llvm-bugs at lists.llvm.org

I noticed the 2 following warnings on i686:

/home/marxin/Programming/gcc/libsanitizer/asan/asan_allocator.cpp: In member
function ‘__sanitizer::uptr __asan::ChunkHeader::UsedSize() const’:
/home/marxin/Programming/gcc/libsanitizer/asan/asan_allocator.cpp:107:41:
warning: left shift count >= width of type [-Wshift-count-overflow]
  107 |       R += (uptr)user_requested_size_hi << (8 *
sizeof(user_requested_size_lo));
      |           
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/marxin/Programming/gcc/libsanitizer/asan/asan_allocator.cpp: In member
function ‘void __asan::ChunkHeader::SetUsedSize(__sanitizer::uptr)’:
/home/marxin/Programming/gcc/libsanitizer/asan/asan_allocator.cpp:114:12:
warning: right shift count >= width of type [-Wshift-count-overflow]
  114 |       size >>= (8 * sizeof(user_requested_size_lo));
      |       ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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