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Commit4c61afa

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Check for interrupts and stack overflow in TParserGet().
TParserGet() recurses for some token types, meaning it's possibleto drive it to stack overflow. Since this is a minority behavior,I chose to add the check_stack_depth() call to the two places thatrecurse rather than doing it during every single call.While at it, add CHECK_FOR_INTERRUPTS(), because this can rununpleasantly long for long inputs.Per bug #17995 from Zuming Jiang. This is old, so back-patchto all supported branches.Discussion:https://postgr.es/m/17995-9f20ff3e6389db4c@postgresql.org
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‎src/backend/tsearch/wparser_def.c‎

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@@ -18,6 +18,7 @@
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#include"catalog/pg_collation.h"
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#include"commands/defrem.h"
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#include"miscadmin.h"
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#include"tsearch/ts_locale.h"
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#include"tsearch/ts_public.h"
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#include"tsearch/ts_type.h"
@@ -632,6 +633,12 @@ p_ishost(TParser *prs)
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tmpprs->wanthost= true;
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/*
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* Check stack depth before recursing. (Since TParserGet() doesn't
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* normally recurse, we put the cost of checking here not there.)
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*/
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check_stack_depth();
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if (TParserGet(tmpprs)&&tmpprs->type==HOST)
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{
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prs->state->posbyte+=tmpprs->lenbytetoken;
@@ -655,6 +662,12 @@ p_isURLPath(TParser *prs)
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tmpprs->state=newTParserPosition(tmpprs->state);
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tmpprs->state->state=TPS_InURLPathFirst;
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/*
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* Check stack depth before recursing. (Since TParserGet() doesn't
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* normally recurse, we put the cost of checking here not there.)
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*/
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check_stack_depth();
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if (TParserGet(tmpprs)&&tmpprs->type==URLPATH)
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{
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prs->state->posbyte+=tmpprs->lenbytetoken;
@@ -1698,6 +1711,8 @@ TParserGet(TParser *prs)
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{
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constTParserStateActionItem*item=NULL;
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CHECK_FOR_INTERRUPTS();
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Assert(prs->state);
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if (prs->state->posbyte >=prs->lenstr)

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