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Further improvements to c8f621c43.

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Coverity and inspection for the issue addressed in fd45d16f found some
questionable code.

Specifically coverity noticed that the wrong length was added in
ReorderBufferSerializeChange() - without immediate negative consequences
as the variable isn't used afterwards.  During code-review and testing I
noticed that a bit of space was wasted when allocating tuple bufs in
several places.  Thirdly, the debug memset()s in
ReorderBufferGetTupleBuf() reduce the error checking valgrind can do.

Backpatch: 9.4, like c8f621c43.
This commit is contained in:
Andres Freund
2016-03-07 14:24:58 -08:00
parent 89f8372cb3
commit e3e84fd358
2 changed files with 18 additions and 9 deletions
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24
src/backend/replication/logical/decode.c
View File

@ -625,7 +625,8 @@ DecodeInsert(LogicalDecodingContext *ctx, XLogRecordBuffer *buf)
if (xlrec->flags & XLOG_HEAP_CONTAINS_NEW_TUPLE)
{
Size tuplelen = r->xl_len - SizeOfHeapInsert;
Size datalen = r->xl_len - SizeOfHeapInsert;
Size tuplelen = datalen - SizeOfHeapHeader;
Assert(r->xl_len > (SizeOfHeapInsert + SizeOfHeapHeader));
@ -633,7 +634,7 @@ DecodeInsert(LogicalDecodingContext *ctx, XLogRecordBuffer *buf)
ReorderBufferGetTupleBuf(ctx->reorder, tuplelen);
DecodeXLogTuple((char *) xlrec + SizeOfHeapInsert,
tuplelen, change->data.tp.newtuple);
datalen, change->data.tp.newtuple);
}
change->data.tp.clear_toast_afterwards = true;
@ -670,6 +671,7 @@ DecodeUpdate(LogicalDecodingContext *ctx, XLogRecordBuffer *buf)
if (xlrec->flags & XLOG_HEAP_CONTAINS_NEW_TUPLE)
{
Size datalen;
Size tuplelen;
xl_heap_header_len xlhdr;
@ -678,12 +680,13 @@ DecodeUpdate(LogicalDecodingContext *ctx, XLogRecordBuffer *buf)
memcpy(&xlhdr, data, sizeof(xlhdr));
data += offsetof(xl_heap_header_len, header);
tuplelen = xlhdr.t_len + SizeOfHeapHeader;
datalen = xlhdr.t_len + SizeOfHeapHeader;
tuplelen = xlhdr.t_len;
change->data.tp.newtuple =
ReorderBufferGetTupleBuf(ctx->reorder, tuplelen);
DecodeXLogTuple(data, tuplelen, change->data.tp.newtuple);
DecodeXLogTuple(data, datalen, change->data.tp.newtuple);
/* skip over the rest of the tuple header */
data += SizeOfHeapHeader;
/* skip over the tuple data */
@ -692,18 +695,20 @@ DecodeUpdate(LogicalDecodingContext *ctx, XLogRecordBuffer *buf)
if (xlrec->flags & XLOG_HEAP_CONTAINS_OLD)
{
Size datalen;
Size tuplelen;
xl_heap_header_len xlhdr;
memcpy(&xlhdr, data, sizeof(xlhdr));
data += offsetof(xl_heap_header_len, header);
tuplelen = xlhdr.t_len + SizeOfHeapHeader;
datalen = xlhdr.t_len + SizeOfHeapHeader;
tuplelen = xlhdr.t_len;
change->data.tp.oldtuple =
ReorderBufferGetTupleBuf(ctx->reorder, tuplelen);
DecodeXLogTuple(data, tuplelen, change->data.tp.oldtuple);
DecodeXLogTuple(data, datalen, change->data.tp.oldtuple);
#ifdef NOT_USED
data += SizeOfHeapHeader;
data += xlhdr.t_len;
@ -741,15 +746,16 @@ DecodeDelete(LogicalDecodingContext *ctx, XLogRecordBuffer *buf)
/* old primary key stored */
if (xlrec->flags & XLOG_HEAP_CONTAINS_OLD)
{
Size len = r->xl_len - SizeOfHeapDelete;
Size datalen = r->xl_len - SizeOfHeapDelete;
Size tuplelen = datalen - SizeOfHeapHeader;
Assert(r->xl_len > (SizeOfHeapDelete + SizeOfHeapHeader));
change->data.tp.oldtuple =
ReorderBufferGetTupleBuf(ctx->reorder, len);
ReorderBufferGetTupleBuf(ctx->reorder, tuplelen);
DecodeXLogTuple((char *) xlrec + SizeOfHeapDelete,
len, change->data.tp.oldtuple);
datalen, change->data.tp.oldtuple);
}
change->data.tp.clear_toast_afterwards = true;

3
src/backend/replication/logical/reorderbuffer.c
View File

@ -469,12 +469,15 @@ ReorderBufferGetTupleBuf(ReorderBuffer *rb, Size tuple_len)
rb->nr_cached_tuplebufs--;
tuple = slist_container(ReorderBufferTupleBuf, node,
slist_pop_head_node(&rb->cached_tuplebufs));
Assert(tuple->alloc_tuple_size == MaxHeapTupleSize);
#ifdef USE_ASSERT_CHECKING
memset(&tuple->tuple, 0xa9, sizeof(HeapTupleData));
VALGRIND_MAKE_MEM_UNDEFINED(&tuple->tuple, sizeof(HeapTupleData));
#endif
tuple->tuple.t_data = ReorderBufferTupleBufData(tuple);
#ifdef USE_ASSERT_CHECKING
memset(tuple->tuple.t_data, 0xa8, tuple->alloc_tuple_size);
VALGRIND_MAKE_MEM_UNDEFINED(tuple->tuple.t_data, tuple->alloc_tuple_size);
#endif
}
else