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More freelist tweaks, avoid referencing freed page

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This commit is contained in:
Howard Chu 2012-05-08 22:17:17 -07:00
parent fadf75a9cb
commit a540597dd6
1 changed files with 14 additions and 1 deletions
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15
libraries/libmdb/mdb.c
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@ -958,6 +958,7 @@ struct MDB_env {
MDB_dbx *me_dbxs; /**< array of static DB info */
MDB_db *me_dbs[2]; /**< two arrays of MDB_db info */
MDB_oldpages *me_pghead; /**< list of old page records */
MDB_oldpages *me_pgfree; /**< list of page records to free */
pthread_key_t me_txkey; /**< thread-key for readers */
MDB_page *me_dpages; /**< list of malloc'd blocks for re-use */
/** IDL of pages that became unused in a write txn */
@ -1316,7 +1317,12 @@ none:
}
if (MDB_IDL_IS_ZERO(mop->mo_pages)) {
txn->mt_env->me_pghead = mop->mo_next;
free(mop);
if (mc->mc_dbi == FREE_DBI) {
mop->mo_next = txn->mt_env->me_pgfree;
txn->mt_env->me_pgfree = mop;
} else {
free(mop);
}
}
}
}
@ -2025,6 +2031,13 @@ again:
env->me_pgfirst = 0;
env->me_pglast = 0;
}
while (env->me_pgfree) {
MDB_oldpages *mop = env->me_pgfree;
env->me_pgfree = mop->mo_next;
free(mop);;
}
/* Check for growth of freelist again */
if (freecnt != txn->mt_free_pgs[0])
goto free2;