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pgsql: Ensure that snprintf.c's fmtint() doesn't overflow when printing

From:	Andres Freund <andres(at)anarazel(dot)de>
To:	pgsql-committers(at)lists(dot)postgresql(dot)org
Subject:	pgsql: Ensure that snprintf.c's fmtint() doesn't overflow when printing
Date:	2018-10-03 20:16:36
Message-ID:	E1g7nZU-0000kU-MB@gemulon.postgresql.org
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Ensure that snprintf.c's fmtint() doesn't overflow when printing INT64_MIN.

This isn't actually a live bug, as the output happens to be the
same. But it upsets tools like UBSan, which makes it worthwhile to
fix.

As it's an issue without practical consequences, don't backpatch.

Branch
------
master

Modified Files
--------------
src/port/snprintf.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

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Next Message	Tom Lane	2018-10-03 20:24:23	Re: pgsql: Ensure that snprintf.c's fmtint() doesn't overflow when printing
Previous Message	Andres Freund	2018-10-03 20:11:59	pgsql: Fix issues around EXPLAIN with JIT.