mirror/openldap
2
0
Fork 0
mirror of https://git.openldap.org/openldap/openldap.git synced 2025-03-07 14:18:15 +08:00
Code Issues Packages Projects Releases Wiki Activity

mdb_node_add(): Plug page leak when MDB_PAGE_FULL.

Browse Source 
Do not fail after mdb_page_new() succeeds.
This commit is contained in:
Hallvard Furuseth 2013-10-03 23:59:25 +02:00
parent 3a1d73daff
commit 8f075595a1
1 changed files with 16 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
libraries/liblmdb/mdb.c
View File

@ -6221,6 +6221,7 @@ mdb_node_add(MDB_cursor *mc, indx_t indx,
{
unsigned int i;
size_t node_size = NODESIZE;
ssize_t room;
indx_t ofs;
MDB_node *node;
MDB_page *mp = mc->mc_pg[mc->mc_top];
@ -6251,9 +6252,9 @@ mdb_node_add(MDB_cursor *mc, indx_t indx,
return MDB_SUCCESS;
}
room = (ssize_t)SIZELEFT(mp) - (ssize_t)sizeof(indx_t);
if (key != NULL)
node_size += key->mv_size;
if (IS_LEAF(mp)) {
assert(data);
if (F_ISSET(flags, F_BIGDATA)) {
@ -6265,26 +6266,23 @@ mdb_node_add(MDB_cursor *mc, indx_t indx,
/* Put data on overflow page. */
DPRINTF(("data size is %"Z"u, node would be %"Z"u, put data on overflow page",
data->mv_size, node_size+data->mv_size));
node_size += sizeof(pgno_t);
node_size += sizeof(pgno_t) + (node_size & 1);
if ((ssize_t)node_size > room)
goto full;
if ((rc = mdb_page_new(mc, P_OVERFLOW, ovpages, &ofp)))
return rc;
DPRINTF(("allocated overflow page %"Z"u", ofp->mp_pgno));
flags |= F_BIGDATA;
goto update;
} else {
node_size += data->mv_size;
}
}
node_size += node_size & 1;
if ((ssize_t)node_size > room)
goto full;
if (node_size + sizeof(indx_t) > SIZELEFT(mp)) {
DPRINTF(("not enough room in page %"Z"u, got %u ptrs",
mp->mp_pgno, NUMKEYS(mp)));
DPRINTF(("upper - lower = %u - %u = %u", mp->mp_upper, mp->mp_lower,
mp->mp_upper - mp->mp_lower));
DPRINTF(("node size = %"Z"u", node_size));
return MDB_PAGE_FULL;
}
update:
/* Move higher pointers up one slot. */
for (i = NUMKEYS(mp); i > indx; i--)
mp->mp_ptrs[i] = mp->mp_ptrs[i - 1];
@ -6330,6 +6328,13 @@ mdb_node_add(MDB_cursor *mc, indx_t indx,
}
return MDB_SUCCESS;
full:
DPRINTF(("not enough room in page %"Z"u, got %u ptrs",
mp->mp_pgno, NUMKEYS(mp)));
DPRINTF(("upper-lower = %u - %u = %"Z"d", mp->mp_upper,mp->mp_lower,room));
DPRINTF(("node size = %"Z"u", node_size));
return MDB_PAGE_FULL;
}
/** Delete the specified node from a page.