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Commit3dd084c

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Fix volatile-safety issue in pltcl_SPI_execute_plan().
The "callargs" variable is modified within PG_TRY and then referencedwithin PG_CATCH, which is exactly the coding pattern we've now foundto be unsafe. Marking "callargs" volatile would be problematic becauseit is passed by reference to some Tcl functions, so fix the problemby not modifying it within PG_TRY. We can just postpone the free()till we exit the PG_TRY construct, as is already done elsewhere in thissame file.Also, fix failure to free(callargs) when exiting on too-many-argumentserror. This is only a minor memory leak, but a leak nonetheless.In passing, remove some unnecessary "volatile" markings in the samefunction. Those doubtless are there because gcc 2.95.3 whinged aboutthem, but we now know that its algorithm for complaining is many bricksshy of a load.This is certainly a live bug with compilers that optimize similarlyto current gcc, so back-patch to all active branches.
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‎src/pl/tcl/pltcl.c

Lines changed: 8 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -2161,9 +2161,9 @@ pltcl_SPI_execute_plan(ClientData cdata, Tcl_Interp *interp,
21612161
intj;
21622162
Tcl_HashEntry*hashent;
21632163
pltcl_query_desc*qdesc;
2164-
constchar*volatilenulls=NULL;
2165-
CONST84char*volatilearrayname=NULL;
2166-
CONST84char*volatileloop_body=NULL;
2164+
constchar*nulls=NULL;
2165+
CONST84char*arrayname=NULL;
2166+
CONST84char*loop_body=NULL;
21672167
intcount=0;
21682168
intcallnargs;
21692169
CONST84char**callargs=NULL;
@@ -2293,6 +2293,8 @@ pltcl_SPI_execute_plan(ClientData cdata, Tcl_Interp *interp,
22932293
if (i!=argc)
22942294
{
22952295
Tcl_SetResult(interp,usage,TCL_STATIC);
2296+
if (callargs)
2297+
ckfree((char*)callargs);
22962298
returnTCL_ERROR;
22972299
}
22982300

@@ -2331,10 +2333,6 @@ pltcl_SPI_execute_plan(ClientData cdata, Tcl_Interp *interp,
23312333
}
23322334
}
23332335

2334-
if (callargs)
2335-
ckfree((char*)callargs);
2336-
callargs=NULL;
2337-
23382336
/************************************************************
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* Execute the plan
23402338
************************************************************/
@@ -2361,6 +2359,9 @@ pltcl_SPI_execute_plan(ClientData cdata, Tcl_Interp *interp,
23612359
}
23622360
PG_END_TRY();
23632361

2362+
if (callargs)
2363+
ckfree((char*)callargs);
2364+
23642365
returnmy_rc;
23652366
}
23662367

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