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patch 9.0.0804: crash when trying to divide a number by -1

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Problem:    Crash when trying to divice the largest negative number by -1.
Solution:   Handle this case specifically.
This commit is contained in:
Bram Moolenaar
2022-10-20 14:17:18 +01:00
parent 43625762a9
commit cdef1cefa2
3 changed files with 15 additions and 1 deletions
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8
src/eval.c
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@@ -66,6 +66,12 @@ num_divide(varnumber_T n1, varnumber_T n2, int *failed)
else
result = VARNUM_MAX;
}
else if (n1 == VARNUM_MIN && n2 == -1)
{
// specific case: trying to do VARNUM_MIN / -1 results in a positive
// number that doesn't fit in varnumber_T and causes an FPE
result = VARNUM_MAX;
}
else
result = n1 / n2;
@@ -6023,7 +6029,7 @@ var2fpos(
}
/*
* Convert list in "arg" into position "psop" and optional file number "fnump".
* Convert list in "arg" into position "posp" and optional file number "fnump".
* When "fnump" is NULL there is no file number, only 3 items: [lnum, col, off]
* Note that the column is passed on as-is, the caller may want to decrement
* it to use 1 for the first column.