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tdb: Refuse to load a database with hash size 0

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This just ensures we reject (rather than div-by-0) a corrupt
DB with a zero hash size.

Found with american fuzzy lop

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>

Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Fri Dec 18 08:26:25 CET 2015 on sn-devel-144
This commit is contained in:
Andrew Bartlett 2015-11-09 14:10:11 +13:00 committed by Jeremy Allison
parent bffcc17567
commit dbd87b94aa
1 changed files with 7 additions and 0 deletions
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7
lib/tdb/common/open.c
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@ -593,6 +593,13 @@ _PUBLIC_ struct tdb_context *tdb_open_ex(const char *name, int hash_size, int td
errno = ENOSYS;
goto fail;
}
if (header.hash_size == 0) {
TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_open_ex: invalid database: 0 hash_size\n"));
errno = ENOSYS;
goto fail;
}
tdb->hash_size = header.hash_size;
if (header.rwlocks == TDB_FEATURE_FLAG_MAGIC) {