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ITS#7589 Fix delete(uneven-sized MDB_DUPFIXED data).

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Do not give uneven sizes to the sub-page and the node it lives in.
This commit is contained in:
Hallvard Furuseth 2013-12-11 11:57:12 +01:00
parent c0858e6d93
commit 6808abe770
1 changed files with 7 additions and 6 deletions
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13
libraries/liblmdb/mdb.c
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@ -6497,21 +6497,19 @@ mdb_node_shrink(MDB_page *mp, indx_t indx)
MDB_node *node;
MDB_page *sp, *xp;
char *base;
int osize, nsize;
int delta;
int nsize, delta;
indx_t i, numkeys, ptr;
node = NODEPTR(mp, indx);
sp = (MDB_page *)NODEDATA(node);
osize = NODEDSZ(node);
delta = sp->mp_upper - sp->mp_lower;
SETDSZ(node, osize - delta);
delta = SIZELEFT(sp);
xp = (MDB_page *)((char *)sp + delta);
/* shift subpage upward */
if (IS_LEAF2(sp)) {
nsize = NUMKEYS(sp) * sp->mp_pad;
if (nsize & 1)
return; /* do not make the node uneven-sized */
memmove(METADATA(xp), METADATA(sp), nsize);
} else {
int i;
@ -6525,6 +6523,9 @@ mdb_node_shrink(MDB_page *mp, indx_t indx)
xp->mp_pad = sp->mp_pad;
COPY_PGNO(xp->mp_pgno, mp->mp_pgno);
nsize = NODEDSZ(node) - delta;
SETDSZ(node, nsize);
/* shift lower nodes upward */
ptr = mp->mp_ptrs[indx];
numkeys = NUMKEYS(mp);