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ITS#8311 fix page_split from update_key

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Check for top of stack. Usually the cursor only has height 1 when
calling page_split, but not always.
This commit is contained in:
Howard Chu 2015-11-18 00:33:25 +00:00
parent a9877f783a
commit f9d3dc8293
1 changed files with 12 additions and 8 deletions
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20
libraries/liblmdb/mdb.c
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@ -6391,16 +6391,18 @@ fix_parent:
* update branch key if there is a parent page
*/
if (mc->mc_top && !mc->mc_ki[mc->mc_top]) {
unsigned short top = mc->mc_top;
unsigned short dtop = 1;
mc->mc_top--;
/* slot 0 is always an empty key, find real slot */
while (mc->mc_top && !mc->mc_ki[mc->mc_top])
while (mc->mc_top && !mc->mc_ki[mc->mc_top]) {
mc->mc_top--;
dtop++;
}
if (mc->mc_ki[mc->mc_top])
rc2 = mdb_update_key(mc, key);
else
rc2 = MDB_SUCCESS;
mc->mc_top = top;
mc->mc_top += dtop;
if (rc2)
return rc2;
}
@ -8249,12 +8251,14 @@ mdb_page_split(MDB_cursor *mc, MDB_val *newkey, MDB_val *newdata, pgno_t newpgno
rp->mp_pad = mp->mp_pad;
DPRINTF(("new right sibling: page %"Z"u", rp->mp_pgno));
if (mc->mc_snum < 2) {
if (mc->mc_top < 1) {
if ((rc = mdb_page_new(mc, P_BRANCH, 1, &pp)))
goto done;
/* shift current top to make room for new parent */
mc->mc_pg[1] = mc->mc_pg[0];
mc->mc_ki[1] = mc->mc_ki[0];
for (i=mc->mc_snum; i>0; i--) {
mc->mc_pg[i] = mc->mc_pg[i-1];
mc->mc_ki[i] = mc->mc_ki[i-1];
}
mc->mc_pg[0] = pp;
mc->mc_ki[0] = 0;
mc->mc_db->md_root = pp->mp_pgno;
@ -8270,8 +8274,8 @@ mdb_page_split(MDB_cursor *mc, MDB_val *newkey, MDB_val *newdata, pgno_t newpgno
mc->mc_db->md_depth--;
goto done;
}
mc->mc_snum = 2;
mc->mc_top = 1;
mc->mc_snum++;
mc->mc_top++;
ptop = 0;
} else {
ptop = mc->mc_top-1;