diff options
| author | Mike Christie <michaelc@cs.wisc.edu> | 2012-01-27 07:13:10 +0400 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2012-02-19 18:09:00 +0400 |
| commit | 1304be5fe0efb42b7ec6a50dd8e1a9bce2adae17 (patch) | |
| tree | bc3d95ab7c1cc5d779df4696aaa138b7cbd89825 /drivers/scsi/iscsi_tcp.c | |
| parent | df1c7baba1b7b3053950f3845a6575aca47ba9ce (diff) | |
| download | linux-1304be5fe0efb42b7ec6a50dd8e1a9bce2adae17.tar.xz | |
[SCSI] libiscsi_tcp: fix max_r2t manipulation
Problem description from Xi Wang:
A large max_r2t could lead to integer overflow in subsequent call to
iscsi_tcp_r2tpool_alloc(), allocating a smaller buffer than expected
and leading to out-of-bounds write.
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/iscsi_tcp.c')
| -rw-r--r-- | drivers/scsi/iscsi_tcp.c | 13 |
1 files changed, 1 insertions, 12 deletions
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c index db47158e0dde..453a740fa68e 100644 --- a/drivers/scsi/iscsi_tcp.c +++ b/drivers/scsi/iscsi_tcp.c @@ -684,10 +684,8 @@ static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn, int buflen) { struct iscsi_conn *conn = cls_conn->dd_data; - struct iscsi_session *session = conn->session; struct iscsi_tcp_conn *tcp_conn = conn->dd_data; struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; - int value; switch(param) { case ISCSI_PARAM_HDRDGST_EN: @@ -699,16 +697,7 @@ static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn, sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage; break; case ISCSI_PARAM_MAX_R2T: - sscanf(buf, "%d", &value); - if (value <= 0 || !is_power_of_2(value)) - return -EINVAL; - if (session->max_r2t == value) - break; - iscsi_tcp_r2tpool_free(session); - iscsi_set_param(cls_conn, param, buf, buflen); - if (iscsi_tcp_r2tpool_alloc(session)) - return -ENOMEM; - break; + return iscsi_tcp_set_max_r2t(conn, buf); default: return iscsi_set_param(cls_conn, param, buf, buflen); } |