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patch 8.2.5006: asan warns for undefined behavior

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Problem:    Asan warns for undefined behavior.
Solution:   Cast the shifted value to unsigned.
This commit is contained in:
Bram Moolenaar
2022-05-22 22:07:52 +01:00
parent 5b529230f1
commit 68e64d2c17
4 changed files with 6 additions and 3 deletions
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3
src/vim9expr.c
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@@ -2716,7 +2716,8 @@ compile_expr5(char_u **arg, cctx_T *cctx, ppconst_T *ppconst)
if (tv2->vval.v_number > MAX_LSHIFT_BITS)
tv1->vval.v_number = 0;
else if (type == EXPR_LSHIFT)
tv1->vval.v_number = tv1->vval.v_number << tv2->vval.v_number;
tv1->vval.v_number =
(uvarnumber_T)tv1->vval.v_number << tv2->vval.v_number;
else
tv1->vval.v_number =
(uvarnumber_T)tv1->vval.v_number >> tv2->vval.v_number;