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Fix NULL pointer dereference in tuplesort.c.

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Oversight in commit e94568ecc.  This could cause a crash when an external
datum tuplesort of a pass-by-value type required multiple passes.
Per report from Mithun Cy.

Peter Geoghegan

Discussion: https://postgr.es/m/CAD__OujuhfWFULGFSt1fyHqUb8N-XafjJhudwt88V0Qs2o84qg@mail.gmail.com
This commit is contained in:
Tom Lane 2017-01-16 13:53:40 -05:00
parent fcf708623e
commit 4e46c97fde
1 changed files with 2 additions and 1 deletions
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3
src/backend/utils/sort/tuplesort.c
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@ -2800,7 +2800,8 @@ mergeonerun(Tuplesortstate *state)
WRITETUP(state, destTape, &state->memtuples[0]);
/* recycle the slot of the tuple we just wrote out, for the next read */
RELEASE_SLAB_SLOT(state, state->memtuples[0].tuple);
if (state->memtuples[0].tuple)
RELEASE_SLAB_SLOT(state, state->memtuples[0].tuple);
/*
* pull next tuple from the tape, and replace the written-out tuple in