Horton

fix-partial-lz4-decompression.patch

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Filename: fix-partial-lz4-decompression.patch
Type: text/x-diff
Part: 0
Message: Re: [HACKERS] Custom compression methods (mac+lz4.h)

Patch

Format: unified
File+−
src/backend/access/common/toast_compression.c 4 0 
diff --git a/src/backend/access/common/toast_compression.c b/src/backend/access/common/toast_compression.c
index 00af1740cf..74e449992a 100644
--- a/src/backend/access/common/toast_compression.c
+++ b/src/backend/access/common/toast_compression.c
@@ -220,6 +220,10 @@ lz4_decompress_datum_slice(const struct varlena *value, int32 slicelength)
 	if (LZ4_versionNumber() < 10803)
 		return lz4_decompress_datum(value);
 
+	/* liblz4 assumes that slicelength is not an overestimate */
+	if (slicelength >= VARRAWSIZE_4B_C(value))
+		return lz4_decompress_datum(value);
+
 	/* allocate memory for the uncompressed data */
 	result = (struct varlena *) palloc(slicelength + VARHDRSZ);