From 92647fc4b9cd7406afb2ee240a20082ba6097177 Mon Sep 17 00:00:00 2001 From: Tom Lane Date: Thu, 21 Apr 2011 19:28:36 -0400 Subject: [PATCH] Avoid possible divide-by-zero in gincostestimate. Per report from Jeff Janes. --- src/backend/utils/adt/selfuncs.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/src/backend/utils/adt/selfuncs.c b/src/backend/utils/adt/selfuncs.c index 4d800f8a00..fa8cecafcb 100644 --- a/src/backend/utils/adt/selfuncs.c +++ b/src/backend/utils/adt/selfuncs.c @@ -6458,6 +6458,10 @@ gincostestimate(PG_FUNCTION_ARGS) numDataPages = Min(numDataPages, numPages - numEntryPages); } + /* In an empty index, numEntries could be zero. Avoid divide-by-zero */ + if (numEntries < 1) + numEntries = 1; + /* * Include predicate in selectivityQuals (should match * genericcostestimate) -- GitLab