Added a fix for src/backend/storage/ipc/shm_mq.c:shm_mq_receive.
commit 936c7268b61460deb201b9e6bbfb60ab5258ec87
Author: Piotr Stefaniak <[email protected]>
Date: Thu Apr 28 18:35:43 2016 +0200
Don't pass null pointers to functions that require the pointers to be non null.
diff --git a/contrib/pgcrypto/px.c b/contrib/pgcrypto/px.c
index cfb3b50..600824a 100644
--- a/contrib/pgcrypto/px.c
+++ b/contrib/pgcrypto/px.c
@@ -180,7 +180,7 @@ combo_init(PX_Combo *cx, const uint8 *key, unsigned klen,
memset(ivbuf, 0, ivs);
if (ivlen > ivs)
memcpy(ivbuf, iv, ivs);
- else
+ else if (ivlen > 0)
memcpy(ivbuf, iv, ivlen);
}
diff --git a/src/backend/access/heap/heapam.c b/src/backend/access/heap/heapam.c
index 950bfc8..bf9a7ab 100644
--- a/src/backend/access/heap/heapam.c
+++ b/src/backend/access/heap/heapam.c
@@ -305,7 +305,7 @@ initscan(HeapScanDesc scan, ScanKey key, bool keep_startblock)
/*
* copy the scan key, if appropriate
*/
- if (key != NULL)
+ if (key != NULL && scan->rs_nkeys > 0)
memcpy(scan->rs_key, key, scan->rs_nkeys * sizeof(ScanKeyData));
/*
diff --git a/src/backend/access/transam/xact.c b/src/backend/access/transam/xact.c
index 95690ff..4ae98e6 100644
--- a/src/backend/access/transam/xact.c
+++ b/src/backend/access/transam/xact.c
@@ -4890,8 +4890,9 @@ SerializeTransactionState(Size maxsize, char *start_address)
{
if (TransactionIdIsValid(s->transactionId))
workspace[i++] = s->transactionId;
- memcpy(&workspace[i], s->childXids,
- s->nChildXids * sizeof(TransactionId));
+ if (s->nChildXids > 0)
+ memcpy(&workspace[i], s->childXids,
+ s->nChildXids * sizeof(TransactionId));
i += s->nChildXids;
}
Assert(i == nxids);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index b4dc617..a72795c 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -1563,9 +1563,12 @@ SnapBuildSerialize(SnapBuild *builder, XLogRecPtr lsn)
/* copy running xacts */
sz = sizeof(TransactionId) * builder->running.xcnt_space;
- memcpy(ondisk_c, builder->running.xip, sz);
- COMP_CRC32C(ondisk->checksum, ondisk_c, sz);
- ondisk_c += sz;
+ if (sz > 0)
+ {
+ memcpy(ondisk_c, builder->running.xip, sz);
+ COMP_CRC32C(ondisk->checksum, ondisk_c, sz);
+ ondisk_c += sz;
+ }
/* copy committed xacts */
sz = sizeof(TransactionId) * builder->committed.xcnt;
diff --git a/src/backend/storage/ipc/shm_mq.c b/src/backend/storage/ipc/shm_mq.c
index 7d1c9cd..7859f42 100644
--- a/src/backend/storage/ipc/shm_mq.c
+++ b/src/backend/storage/ipc/shm_mq.c
@@ -492,7 +492,7 @@ shm_mq_receive(shm_mq_handle *mqh, Size *nbytesp, void **datap, bool nowait)
shm_mq_result res;
Size rb = 0;
Size nbytes;
- void *rawdata;
+ void *rawdata = NULL;
Assert(mq->mq_receiver == MyProc);
@@ -673,7 +673,11 @@ shm_mq_receive(shm_mq_handle *mqh, Size *nbytesp, void **datap, bool nowait)
/* Copy as much as we can. */
Assert(mqh->mqh_partial_bytes + rb <= nbytes);
- memcpy(&mqh->mqh_buffer[mqh->mqh_partial_bytes], rawdata, rb);
+ if (rb > 0)
+ {
+ Assert(rawdata != NULL);
+ memcpy(&mqh->mqh_buffer[mqh->mqh_partial_bytes], rawdata, rb);
+ }
mqh->mqh_partial_bytes += rb;
/*
diff --git a/src/backend/utils/time/snapmgr.c b/src/backend/utils/time/snapmgr.c
index 0a9a231..ff09171 100644
--- a/src/backend/utils/time/snapmgr.c
+++ b/src/backend/utils/time/snapmgr.c
@@ -506,12 +506,14 @@ SetTransactionSnapshot(Snapshot sourcesnap, TransactionId sourcexid,
CurrentSnapshot->xmax = sourcesnap->xmax;
CurrentSnapshot->xcnt = sourcesnap->xcnt;
Assert(sourcesnap->xcnt <= GetMaxSnapshotXidCount());
- memcpy(CurrentSnapshot->xip, sourcesnap->xip,
- sourcesnap->xcnt * sizeof(TransactionId));
+ if (sourcesnap->xcnt > 0)
+ memcpy(CurrentSnapshot->xip, sourcesnap->xip,
+ sourcesnap->xcnt * sizeof(TransactionId));
CurrentSnapshot->subxcnt = sourcesnap->subxcnt;
Assert(sourcesnap->subxcnt <= GetMaxSnapshotSubxidCount());
- memcpy(CurrentSnapshot->subxip, sourcesnap->subxip,
- sourcesnap->subxcnt * sizeof(TransactionId));
+ if (sourcesnap->subxcnt > 0)
+ memcpy(CurrentSnapshot->subxip, sourcesnap->subxip,
+ sourcesnap->subxcnt * sizeof(TransactionId));
CurrentSnapshot->suboverflowed = sourcesnap->suboverflowed;
CurrentSnapshot->takenDuringRecovery = sourcesnap->takenDuringRecovery;
/* NB: curcid should NOT be copied, it's a local matter */
diff --git a/src/backend/utils/time/tqual.c b/src/backend/utils/time/tqual.c
index 0e815a9..0f26bd8 100644
--- a/src/backend/utils/time/tqual.c
+++ b/src/backend/utils/time/tqual.c
@@ -1639,6 +1639,7 @@ HeapTupleHeaderIsOnlyLocked(HeapTupleHeader tuple)
static bool
TransactionIdInArray(TransactionId xid, TransactionId *xip, Size num)
{
+ Assert(xip != NULL);
return bsearch(&xid, xip, num,
sizeof(TransactionId), xidComparator) != NULL;
}
@@ -1675,7 +1676,7 @@ HeapTupleSatisfiesHistoricMVCC(HeapTuple htup, Snapshot snapshot,
return false;
}
/* check if it's one of our txids, toplevel is also in there */
- else if (TransactionIdInArray(xmin, snapshot->subxip, snapshot->subxcnt))
+ else if (snapshot->subxcnt > 0 && TransactionIdInArray(xmin, snapshot->subxip, snapshot->subxcnt))
{
bool resolved;
CommandId cmin = HeapTupleHeaderGetRawCommandId(tuple);
@@ -1717,7 +1718,7 @@ HeapTupleSatisfiesHistoricMVCC(HeapTuple htup, Snapshot snapshot,
return false;
}
/* check if it's a committed transaction in [xmin, xmax) */
- else if (TransactionIdInArray(xmin, snapshot->xip, snapshot->xcnt))
+ else if (snapshot->xcnt > 0 && TransactionIdInArray(xmin, snapshot->xip, snapshot->xcnt))
{
/* fall through */
}
@@ -1750,7 +1751,7 @@ HeapTupleSatisfiesHistoricMVCC(HeapTuple htup, Snapshot snapshot,
}
/* check if it's one of our txids, toplevel is also in there */
- if (TransactionIdInArray(xmax, snapshot->subxip, snapshot->subxcnt))
+ if (snapshot->subxcnt > 0 && TransactionIdInArray(xmax, snapshot->subxip, snapshot->subxcnt))
{
bool resolved;
CommandId cmin;
@@ -1788,7 +1789,7 @@ HeapTupleSatisfiesHistoricMVCC(HeapTuple htup, Snapshot snapshot,
else if (TransactionIdFollowsOrEquals(xmax, snapshot->xmax))
return true;
/* xmax is between [xmin, xmax), check known committed array */
- else if (TransactionIdInArray(xmax, snapshot->xip, snapshot->xcnt))
+ else if (snapshot->xcnt > 0 && TransactionIdInArray(xmax, snapshot->xip, snapshot->xcnt))
return false;
/* xmax is between [xmin, xmax), but known not to have committed yet */
else
diff --git a/src/fe_utils/print.c b/src/fe_utils/print.c
index 1ec74f1..ca0eb7e 100644
--- a/src/fe_utils/print.c
+++ b/src/fe_utils/print.c
@@ -914,7 +914,8 @@ print_aligned_text(const printTableContent *cont, FILE *fout, bool is_pager)
more_col_wrapping = col_count;
curr_nl_line = 0;
- memset(header_done, false, col_count * sizeof(bool));
+ if (col_count > 0)
+ memset(header_done, false, col_count * sizeof(bool));
while (more_col_wrapping)
{
if (opt_border == 2)
--
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