0001-pg_dump-Fix-dangling-pointer-in-EndCompressorZstd.patch

From 428c60888f96aa5d0b7575a4342cdce4ff0257ab Mon Sep 17 00:00:00 2001
From: Alexander Kuznetsov <kuznetsovam@altlinux.org>
Date: Wed, 16 Apr 2025 11:19:56 +0300
Subject: [PATCH] pg_dump: Fix dangling pointer in EndCompressorZstd()
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cs->private_data becomes dangling after pg_free() call and should be set to NULL
(consistent with other EndCompressor implementations)

Found by Linux Verification Center (linuxtesting.org) with Svace.
---
 src/bin/pg_dump/compress_zstd.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/bin/pg_dump/compress_zstd.c b/src/bin/pg_dump/compress_zstd.c
index 1f7b4942706..cb595b10c2d 100644
--- a/src/bin/pg_dump/compress_zstd.c
+++ b/src/bin/pg_dump/compress_zstd.c
@@ -142,6 +142,7 @@ EndCompressorZstd(ArchiveHandle *AH, CompressorState *cs)
 	/* output buffer may be allocated in either mode */
 	pg_free(zstdcs->output.dst);
 	pg_free(zstdcs);
+	cs->private_data = NULL;
 }
 
 static void
-- 
2.42.4