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Commit4f9f495

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Fix crash bug in RestoreSnapshot.
If serialized_snapshot->subxcnt > 0 and serialized_snapshot->xcnt == 0,the old coding would do the wrong thing and crash. This can happenon standby servers.Report by Andreas Seltenreich. Patch by Thomas Munro, reviewed byAmit Kapila and tested by Andreas Seltenreich.
1 parent10c0558 commit4f9f495

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‎src/backend/utils/time/snapmgr.c

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -2016,7 +2016,8 @@ RestoreSnapshot(char *start_address)
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/* Copy SubXIDs, if present. */
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if (serialized_snapshot->subxcnt>0)
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{
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snapshot->subxip=snapshot->xip+serialized_snapshot->xcnt;
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snapshot->subxip= ((TransactionId*) (snapshot+1))+
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serialized_snapshot->xcnt;
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memcpy(snapshot->subxip,serialized_xids+serialized_snapshot->xcnt,
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serialized_snapshot->subxcnt*sizeof(TransactionId));
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}

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