Fix a bunch of places that called malloc and friends with no NULL check.

Where possible, use palloc or pg_malloc instead; otherwise, insert
explicit NULL checks.

Generally speaking, these are places where an actual OOM is quite
unlikely, either because they're in client programs that don't
allocate all that much, or they're very early in process startup
so that we'd likely have had a fork() failure instead.  Hence,
no back-patch, even though this is nominally a bug fix.

Michael Paquier, with some adjustments by me

Discussion: <CAB7nPqRu07Ot6iht9i9KRfYLpDaF2ZuUv5y_+72uP23ZAGysRg@mail.gmail.com>

3 files changed, 26 insertions, 26 deletions

diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 908a7ce8002..db2b55982b6 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -119,7 +119,7 @@ main(int argc, char **argv)
 	for (i = 0; i < testspec->nsessions; i++)
 		nallsteps += testspec->sessions[i]->nsteps;
 
-	allsteps = malloc(nallsteps * sizeof(Step *));
+	allsteps = pg_malloc(nallsteps * sizeof(Step *));
 
 	n = 0;
 	for (i = 0; i < testspec->nsessions; i++)
@@ -190,7 +190,7 @@ main(int argc, char **argv)
 		if (PQresultStatus(res) == PGRES_TUPLES_OK)
 		{
 			if (PQntuples(res) == 1 && PQnfields(res) == 1)
-				backend_pids[i] = strdup(PQgetvalue(res, 0, 0));
+				backend_pids[i] = pg_strdup(PQgetvalue(res, 0, 0));
 			else
 			{
 				fprintf(stderr, "backend pid query returned %d rows and %d columns, expected 1 row and 1 column",
@@ -286,7 +286,7 @@ run_all_permutations(TestSpec *testspec)
 	for (i = 0; i < testspec->nsessions; i++)
 		nsteps += testspec->sessions[i]->nsteps;
 
-	steps = malloc(sizeof(Step *) * nsteps);
+	steps = pg_malloc(sizeof(Step *) * nsteps);
 
 	/*
 	 * To generate the permutations, we conceptually put the steps of each
@@ -297,7 +297,7 @@ run_all_permutations(TestSpec *testspec)
 	 * A pile is actually just an integer which tells how many steps we've
 	 * already picked from this pile.
 	 */
-	piles = malloc(sizeof(int) * testspec->nsessions);
+	piles = pg_malloc(sizeof(int) * testspec->nsessions);
 	for (i = 0; i < testspec->nsessions; i++)
 		piles[i] = 0;
 
@@ -345,7 +345,7 @@ run_named_permutations(TestSpec *testspec)
 		Permutation *p = testspec->permutations[i];
 		Step	  **steps;
 
-		steps = malloc(p->nsteps * sizeof(Step *));
+		steps = pg_malloc(p->nsteps * sizeof(Step *));
 
 		/* Find all the named steps using the lookup table */
 		for (j = 0; j < p->nsteps; j++)
@@ -476,8 +476,8 @@ run_permutation(TestSpec *testspec, int nsteps, Step **steps)
 		return;
 	}
 
-	waiting = malloc(sizeof(Step *) * testspec->nsessions);
-	errorstep = malloc(sizeof(Step *) * testspec->nsessions);
+	waiting = pg_malloc(sizeof(Step *) * testspec->nsessions);
+	errorstep = pg_malloc(sizeof(Step *) * testspec->nsessions);
 
 	printf("\nstarting permutation:");
 	for (i = 0; i < nsteps; i++)
diff --git a/src/test/isolation/specparse.y b/src/test/isolation/specparse.y
index fce6cc6c940..59744cea54d 100644
--- a/src/test/isolation/specparse.y
+++ b/src/test/isolation/specparse.y
@@ -73,8 +73,8 @@ setup_list:
 			}
 			| setup_list setup
 			{
-				$$.elements = realloc($1.elements,
-									  ($1.nelements + 1) * sizeof(void *));
+				$$.elements = pg_realloc($1.elements,
+										 ($1.nelements + 1) * sizeof(void *));
 				$$.elements[$1.nelements] = $2;
 				$$.nelements = $1.nelements + 1;
 			}
@@ -97,15 +97,15 @@ opt_teardown:
 session_list:
 			session_list session
 			{
-				$$.elements = realloc($1.elements,
-									  ($1.nelements + 1) * sizeof(void *));
+				$$.elements = pg_realloc($1.elements,
+										 ($1.nelements + 1) * sizeof(void *));
 				$$.elements[$1.nelements] = $2;
 				$$.nelements = $1.nelements + 1;
 			}
 			| session
 			{
 				$$.nelements = 1;
-				$$.elements = malloc(sizeof(void *));
+				$$.elements = pg_malloc(sizeof(void *));
 				$$.elements[0] = $1;
 			}
 		;
@@ -113,7 +113,7 @@ session_list:
 session:
 			SESSION string_literal opt_setup step_list opt_teardown
 			{
-				$$ = malloc(sizeof(Session));
+				$$ = pg_malloc(sizeof(Session));
 				$$->name = $2;
 				$$->setupsql = $3;
 				$$->steps = (Step **) $4.elements;
@@ -125,15 +125,15 @@ session:
 step_list:
 			step_list step
 			{
-				$$.elements = realloc($1.elements,
-									  ($1.nelements + 1) * sizeof(void *));
+				$$.elements = pg_realloc($1.elements,
+										 ($1.nelements + 1) * sizeof(void *));
 				$$.elements[$1.nelements] = $2;
 				$$.nelements = $1.nelements + 1;
 			}
 			| step
 			{
 				$$.nelements = 1;
-				$$.elements = malloc(sizeof(void *));
+				$$.elements = pg_malloc(sizeof(void *));
 				$$.elements[0] = $1;
 			}
 		;
@@ -142,7 +142,7 @@ step_list:
 step:
 			STEP string_literal sqlblock
 			{
-				$$ = malloc(sizeof(Step));
+				$$ = pg_malloc(sizeof(Step));
 				$$->name = $2;
 				$$->sql = $3;
 				$$->errormsg = NULL;
@@ -164,15 +164,15 @@ opt_permutation_list:
 permutation_list:
 			permutation_list permutation
 			{
-				$$.elements = realloc($1.elements,
-									  ($1.nelements + 1) * sizeof(void *));
+				$$.elements = pg_realloc($1.elements,
+										 ($1.nelements + 1) * sizeof(void *));
 				$$.elements[$1.nelements] = $2;
 				$$.nelements = $1.nelements + 1;
 			}
 			| permutation
 			{
 				$$.nelements = 1;
-				$$.elements = malloc(sizeof(void *));
+				$$.elements = pg_malloc(sizeof(void *));
 				$$.elements[0] = $1;
 			}
 		;
@@ -181,7 +181,7 @@ permutation_list:
 permutation:
 			PERMUTATION string_literal_list
 			{
-				$$ = malloc(sizeof(Permutation));
+				$$ = pg_malloc(sizeof(Permutation));
 				$$->stepnames = (char **) $2.elements;
 				$$->nsteps = $2.nelements;
 			}
@@ -190,15 +190,15 @@ permutation:
 string_literal_list:
 			string_literal_list string_literal
 			{
-				$$.elements = realloc($1.elements,
-									  ($1.nelements + 1) * sizeof(void *));
+				$$.elements = pg_realloc($1.elements,
+										 ($1.nelements + 1) * sizeof(void *));
 				$$.elements[$1.nelements] = $2;
 				$$.nelements = $1.nelements + 1;
 			}
 			| string_literal
 			{
 				$$.nelements = 1;
-				$$.elements = malloc(sizeof(void *));
+				$$.elements = pg_malloc(sizeof(void *));
 				$$.elements[0] = $1;
 			}
 		;
diff --git a/src/test/isolation/specscanner.l b/src/test/isolation/specscanner.l
index 675bd21f175..6f081d567c5 100644
--- a/src/test/isolation/specscanner.l
+++ b/src/test/isolation/specscanner.l
@@ -56,7 +56,7 @@ teardown		{ return(TEARDOWN); }
 				}
 <qstr>\"		{
 					litbuf[litbufpos] = '\0';
-					yylval.str = strdup(litbuf);
+					yylval.str = pg_strdup(litbuf);
 					BEGIN(INITIAL);
 					return(string_literal);
 				}
@@ -72,7 +72,7 @@ teardown		{ return(TEARDOWN); }
 				}
 <sql>{space}*"}" {
 					litbuf[litbufpos] = '\0';
-					yylval.str = strdup(litbuf);
+					yylval.str = pg_strdup(litbuf);
 					BEGIN(INITIAL);
 					return(sqlblock);
 				}