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ITS#8321 fix mdb_cursor_shadow()

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Set a valid txn so that cursor fixup code works on the shadows
This commit is contained in:
Howard Chu 2015-11-23 01:13:16 +00:00
parent 0ec3967e1d
commit 94831f7c3f
1 changed files with 6 additions and 5 deletions
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11
libraries/liblmdb/mdb.c
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@ -2489,14 +2489,15 @@ mdb_cursor_shadow(MDB_txn *src, MDB_txn *dst)
*bk = *mc;
mc->mc_backup = bk;
mc->mc_db = &dst->mt_dbs[i];
/* Kill pointers into src - and dst to reduce abuse: The
* user may not use mc until dst ends. Otherwise we'd...
/* Kill pointers into src to reduce abuse: The
* user may not use mc until dst ends. But we need a valid
* txn pointer here for cursor fixups to keep working.
*/
mc->mc_txn = NULL; /* ...set this to dst */
mc->mc_dbflag = NULL; /* ...and &dst->mt_dbflags[i] */
mc->mc_txn = dst;
mc->mc_dbflag = &dst->mt_dbflags[i];
if ((mx = mc->mc_xcursor) != NULL) {
*(MDB_xcursor *)(bk+1) = *mx;
mx->mx_cursor.mc_txn = NULL; /* ...and dst. */
mx->mx_cursor.mc_txn = dst;
}
mc->mc_next = dst->mt_cursors[i];
dst->mt_cursors[i] = mc;