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Avoid undefined behavior of left shifting negative integer; #3728

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This commit is contained in:
Yukihiro "Matz" Matsumoto
2017-07-05 03:07:44 +09:00
parent c377d504f6
commit cc01dedc65
1 changed files with 2 additions and 2 deletions
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src/numeric.c
+2 -2
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@@ -962,16 +962,16 @@ lshift(mrb_state *mrb, mrb_int val, mrb_int width)
(val > (MRB_INT_MAX >> width))) {
goto bit_overflow;
}
return mrb_fixnum_value(val << width);
}
else {
if ((width > NUMERIC_SHIFT_WIDTH_MAX) ||
(val < (MRB_INT_MIN >> width))) {
goto bit_overflow;
}
return mrb_fixnum_value(val * (1u << width));
}
return mrb_fixnum_value(val << width);
bit_overflow:
{
mrb_float f = (mrb_float)val;