Avoid calling memcpy() with a NULL source pointer and count == 0.
As in commit 0a52d378b03b7d5a, avoid doing something that has undefined
results according to the C standard, even though in practice there does
not seem to be any problem with it.
This fixes two places in numeric.c that demonstrably could call memcpy()
with such arguments. I looked through that file and didn't see any other
places with similar hazards; this is not to claim that there are not such
places in other files.
Per report from Piotr Stefaniak. Back-patch to 9.5 which is where the
previous commit was added. We're more or less setting a precedent that
we will not worry about this type of issue in pre-9.5 branches unless
someone demonstrates a problem in the field.
Branch
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master
Details
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http://git.postgresql.org/pg/commitdiff/13bba02271dce865cd20b6f49224889c73fed4e7
Modified Files
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src/backend/utils/adt/numeric.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)