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Fix memory leak in xlogreader facility.

XLogReaderFree failed to free the per-block data buffers, when theyhappened to not be used by the latest read WAL record.Michael Paquier. Backpatch to 9.5, where the per-block buffers were added.

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src/backend/access/transam
- xlogreader.c

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-5

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`‎src/backend/access/transam/xlogreader.c`

Lines changed: 2 additions & 5 deletions

Original file line number	Diff line number	Diff line change
`@@ -126,11 +126,8 @@ XLogReaderFree(XLogReaderState *state)`
`126`	`126`
`127`	`127`	`for (block_id=0;block_id <=state->max_block_id;block_id++)`
`128`	`128`	`{`
`129`		`-if (state->blocks[block_id].in_use)`
`130`		`-{`
`131`		`-if (state->blocks[block_id].data)`
`132`		`-pfree(state->blocks[block_id].data);`
`133`		`-}`
	`129`	`+if (state->blocks[block_id].data)`
	`130`	`+pfree(state->blocks[block_id].data);`
`134`	`131`	`}`
`135`	`132`	`if (state->main_data)`
`136`	`133`	`pfree(state->main_data);`

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Commit61a65c5

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`‎src/backend/access/transam/xlogreader.c`

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