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From: Alexander Lakhin <[email protected]>
To: Michael Paquier <[email protected]>
To: cca5507 <[email protected]>
Cc: Jim Jones <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: pgsql-bugs <[email protected]>
Cc: maralist86 <[email protected]>
Subject: Re: BUG #18943: Return value of a function 'xmlBufferCreate' isdereferenced at xpath.c:177 without checking for NUL
Date: Thu, 12 Mar 2026 07:00:00 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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	<[email protected]>

Hello Michael,

Maybe you would like to fix in passing one more anomaly there:
create extension xml2;
select xslt_process('<aaa/>','<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"></xsl:stylesheet>';);

leads to:
varlena.c:199:2: runtime error: null pointer passed as argument 2, which is declared to never be null
     #0 0x640756666936 in cstring_to_text_with_len .../src/backend/utils/adt/varlena.c:199
     #1 0x7e46c0f4805e in xslt_process .../contrib/xml2/xslt_proc.c:149
     #2 0x640755a3ecbf in ExecInterpExpr .../src/backend/executor/execExprInterp.c:1001
     #3 0x640755a277aa in ExecInterpExprStillValid .../src/backend/executor/execExprInterp.c:2299
     #4 0x640755ef11e0 in ExecEvalExprSwitchContext ../../../../src/include/executor/executor.h:444
     #5 0x640755efd7b6 in evaluate_expr .../src/backend/optimizer/util/clauses.c:5724

for a build made with -fsanitize=undefined.

Best regards,
Alexander

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