Fix possible internal overflow in numeric division.
div_var_fast() postpones propagating carries in the same way as mul_var(),
so it has the same corner-case overflow risk we fixed in 246693e5ae8a36f0,
namely that the size of the carries has to be accounted for when setting
the threshold for executing a carry propagation step. We've not devised
a test case illustrating the brokenness, but the required fix seems clear
enough. Like the previous fix, back-patch to all active branches.
Dean Rasheed
Branch
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REL9_4_STABLE
Details
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http://git.postgresql.org/pg/commitdiff/cc95595e05c086a53a64eea2b17d135a80548106
Modified Files
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src/backend/utils/adt/numeric.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)