[llvm-bugs] [Bug 33133] New: UBSan misses check for "negative_value << 0"

via llvm-bugs llvm-bugs at lists.llvm.org
Mon May 22 16:22:19 PDT 2017


            Bug ID: 33133
           Summary: UBSan misses check for "negative_value << 0"
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: libclang
          Assignee: unassignedclangbugs at nondot.org
          Reporter: babokin at gmail.com
                CC: klimek at google.com, llvm-bugs at lists.llvm.org

> cat f.cpp
int i = -1;
int z = 0;

int main() {
  return (i << 0) + (i << z);

> clang++ -fsanitize=undefined f.cpp

> ./a.out

No error is issued.

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