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ldb client controls: avoid talloc_memdup(x, y, (size_t)-1);

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ldb_base64_decode() returns -1 if a string can't be parsed as base64,
and this is not the kind of value you want to use in talloc_memdup().

In these cases it can happen innocently if the strings are truncated
to fit in their buffers.

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by:  Volker Lendecke <Volker.Lendecke@SerNet.DE>
Reviewed-by: Jeremy Allison <jra@samba.org>

Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Sat Mar 19 00:56:42 CET 2016 on sn-devel-144
This commit is contained in:
Douglas Bagnall 2016-03-16 12:46:12 +13:00 committed by Jeremy Allison
parent ac4dc0c678
commit e806824fc8
1 changed files with 27 additions and 4 deletions
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31
lib/ldb/common/ldb_controls.c
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@ -507,8 +507,16 @@ struct ldb_control *ldb_parse_control_from_string(struct ldb_context *ldb, TALLO
control->match.byOffset.contentCount = cc;
}
if (ctxid[0]) {
control->ctxid_len = ldb_base64_decode(ctxid);
control->contextId = talloc_memdup(control, ctxid, control->ctxid_len);
int len = ldb_base64_decode(ctxid);
if (len < 0) {
ldb_set_errstring(ldb,
"invalid VLV context_id\n");
talloc_free(ctrl);
return NULL;
}
control->ctxid_len = len;
control->contextId = talloc_memdup(control, ctxid,
control->ctxid_len);
} else {
control->ctxid_len = 0;
control->contextId = NULL;
@ -552,7 +560,14 @@ struct ldb_control *ldb_parse_control_from_string(struct ldb_context *ldb, TALLO
control->flags = flags;
control->max_attributes = max_attrs;
if (*cookie) {
control->cookie_len = ldb_base64_decode(cookie);
int len = ldb_base64_decode(cookie);
if (len < 0) {
ldb_set_errstring(ldb,
"invalid dirsync cookie\n");
talloc_free(ctrl);
return NULL;
}
control->cookie_len = len;
control->cookie = (char *)talloc_memdup(control, cookie, control->cookie_len);
} else {
control->cookie = NULL;
@ -597,7 +612,15 @@ struct ldb_control *ldb_parse_control_from_string(struct ldb_context *ldb, TALLO
control->flags = flags;
control->max_attributes = max_attrs;
if (*cookie) {
control->cookie_len = ldb_base64_decode(cookie);
int len = ldb_base64_decode(cookie);
if (len < 0) {
ldb_set_errstring(ldb,
"invalid dirsync_ex cookie"
" (probably too long)\n");
talloc_free(ctrl);
return NULL;
}
control->cookie_len = len;
control->cookie = (char *)talloc_memdup(control, cookie, control->cookie_len);
} else {
control->cookie = NULL;