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Commitf270a16

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Check for GiST index tuples that don't fit on a page.
The page splitting code would go into infinite recursion if you try toinsert an index tuple that doesn't fit even on an empty page.Per analysis and suggested fix by Andrew Gierth. Fixes bug #11555, reportedby Bryan Seitz (analysis happened over IRC). Backpatch to all supportedversions.
1 parent7f71c89 commitf270a16

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‎src/backend/access/gist/gist.c

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Original file line numberDiff line numberDiff line change
@@ -1395,6 +1395,23 @@ gistSplit(Relation r,
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inti;
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SplitedPageLayout*res=NULL;
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/* this should never recurse very deeply, but better safe than sorry */
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check_stack_depth();
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/* there's no point in splitting an empty page */
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Assert(len>0);
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/*
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* If a single tuple doesn't fit on a page, no amount of splitting will
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* help.
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*/
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if (len==1)
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ereport(ERROR,
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(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
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errmsg("index row size %zu exceeds maximum %zu for index \"%s\"",
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IndexTupleSize(itup[0]),GiSTPageSize,
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RelationGetRelationName(r))));
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memset(v.spl_lisnull, TRUE,sizeof(bool)*giststate->tupdesc->natts);
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memset(v.spl_risnull, TRUE,sizeof(bool)*giststate->tupdesc->natts);
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gistSplitByKey(r,page,itup,len,giststate,&v,0);

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