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Allow mdb_cursor_close() after readonly txn ends.

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Catch mdb_cursor_renew(write txn's cursor).  Add flag C_UNTRACK, so
mdb_cursor_close need not peek inside a possibly-freed readonly txn.
This commit is contained in:
Hallvard Furuseth 2013-05-04 12:34:02 +02:00
parent 17ffe9c992
commit 385889b0be
1 changed files with 4 additions and 2 deletions
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6
libraries/liblmdb/mdb.c
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@ -900,6 +900,7 @@ struct MDB_cursor {
#define C_SHADOW 0x08 /**< Cursor is a dup from a parent txn */
#define C_ALLOCD 0x10 /**< Cursor was malloc'd */
#define C_SPLITTING 0x20 /**< Cursor is in page_split */
#define C_UNTRACK 0x40 /**< Un-track cursor when closing */
/** @} */
unsigned int mc_flags; /**< @ref mdb_cursor */
MDB_page *mc_pg[CURSOR_STACK]; /**< stack of pushed pages */
@ -5858,6 +5859,7 @@ mdb_cursor_open(MDB_txn *txn, MDB_dbi dbi, MDB_cursor **ret)
if (txn->mt_cursors) {
mc->mc_next = txn->mt_cursors[dbi];
txn->mt_cursors[dbi] = mc;
mc->mc_flags |= C_UNTRACK;
}
mc->mc_flags |= C_ALLOCD;
} else {
@ -5877,7 +5879,7 @@ mdb_cursor_renew(MDB_txn *txn, MDB_cursor *mc)
if (txn == NULL || mc == NULL || mc->mc_dbi >= txn->mt_numdbs)
return EINVAL;
if (txn->mt_cursors)
if ((mc->mc_flags & C_UNTRACK) || txn->mt_cursors)
return EINVAL;
flags = mc->mc_flags;
@ -5917,7 +5919,7 @@ mdb_cursor_close(MDB_cursor *mc)
{
if (mc != NULL) {
/* remove from txn, if tracked */
if (mc->mc_txn->mt_cursors) {
if ((mc->mc_flags & C_UNTRACK) && mc->mc_txn->mt_cursors) {
MDB_cursor **prev = &mc->mc_txn->mt_cursors[mc->mc_dbi];
while (*prev && *prev != mc) prev = &(*prev)->mc_next;
if (*prev == mc)