UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

scsi: libcxgbi: simplify task->hdr allocation for mgmt cmds 

In case of mgmt cmds, task->hdr is dereferenced after transmitting the
pdu in iscsi_tcp_task_xmit(). To handle this case current code
increments the Tx skb reference count and frees the skb in
cxgbi_cleanup_task(). In some error cases this results in skb leak.

To fix this in case of mgmt cmds, allocate a separate buffer for iSCSI
hdr and free this buffer in cxgbi_cleanup_task().

Signed-off-by: Varun Prakash <varun@chelsio.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Varun Prakash 2017-10-11 19:33:21 +05:30 committed by Martin K. Petersen
parent 9b3a081fb6
commit 2269848386
2 changed files with 28 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
drivers/scsi/cxgbi/libcxgbi.c
View File

@ -1887,16 +1887,13 @@ int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
struct iscsi_tcp_task *tcp_task = task->dd_data;
struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
struct scsi_cmnd *sc = task->sc;
struct cxgbi_sock *csk = cconn->cep->csk;
struct net_device *ndev = cdev->ports[csk->port_id];
int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
tcp_task->dd_data = tdata;
task->hdr = NULL;
if (tdata->skb) {
kfree_skb(tdata->skb);
tdata->skb = NULL;
}
if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
(opcode == ISCSI_OP_SCSI_DATA_OUT ||
(opcode == ISCSI_OP_SCSI_CMD &&
@ -1908,15 +1905,23 @@ int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
if (!tdata->skb) {
struct cxgbi_sock *csk = cconn->cep->csk;
struct net_device *ndev = cdev->ports[csk->port_id];
ndev->stats.tx_dropped++;
return -ENOMEM;
}
skb_get(tdata->skb);
skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
task->hdr = (struct iscsi_hdr *)tdata->skb->data;
if (task->sc) {
task->hdr = (struct iscsi_hdr *)tdata->skb->data;
} else {
task->hdr = kzalloc(SKB_TX_ISCSI_PDU_HEADER_MAX, GFP_KERNEL);
if (!task->hdr) {
__kfree_skb(tdata->skb);
tdata->skb = NULL;
ndev->stats.tx_dropped++;
return -ENOMEM;
}
}
task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
/* data_out uses scsi_cmd's itt */
@ -2060,9 +2065,9 @@ int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
unsigned int datalen;
int err;
if (!skb || cxgbi_skcb_test_flag(skb, SKCBF_TX_DONE)) {
if (!skb) {
log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
"task 0x%p, skb 0x%p\n", task, skb);
"task 0x%p\n", task);
return 0;
}
@ -2074,6 +2079,7 @@ int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
return -EPIPE;
}
tdata->skb = NULL;
datalen = skb->data_len;
/* write ppod first if using ofldq to write ppod */
@ -2087,6 +2093,9 @@ int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
/* continue. Let fl get the data */
}
if (!task->sc)
memcpy(skb->data, task->hdr, SKB_TX_ISCSI_PDU_HEADER_MAX);
err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
if (err > 0) {
int pdulen = err;
@ -2102,7 +2111,6 @@ int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
pdulen += ISCSI_DIGEST_SIZE;
task->conn->txdata_octets += pdulen;
cxgbi_skcb_set_flag(skb, SKCBF_TX_DONE);
return 0;
}
@ -2111,6 +2119,7 @@ int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
"task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
task, skb, skb->len, skb->data_len, err);
/* reset skb to send when we are called again */
tdata->skb = skb;
return err;
}
@ -2118,8 +2127,7 @@ int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
"itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
task->itt, skb, skb->len, skb->data_len, err);
__kfree_skb(tdata->skb);
tdata->skb = NULL;
__kfree_skb(skb);
iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
@ -2144,9 +2152,14 @@ void cxgbi_cleanup_task(struct iscsi_task *task)
task, tdata->skb, task->hdr_itt);
tcp_task->dd_data = NULL;
if (!task->sc)
kfree(task->hdr);
task->hdr = NULL;
/* never reached the xmit task callout */
if (tdata->skb) {
kfree_skb(tdata->skb);
__kfree_skb(tdata->skb);
tdata->skb = NULL;
}

1
drivers/scsi/cxgbi/libcxgbi.h
View File

@ -205,7 +205,6 @@ enum cxgbi_skcb_flags {
SKCBF_TX_NEED_HDR, /* packet needs a header */
SKCBF_TX_MEM_WRITE, /* memory write */
SKCBF_TX_FLAG_COMPL, /* wr completion flag */
SKCBF_TX_DONE, /* skb tx done */
SKCBF_RX_COALESCED, /* received whole pdu */
SKCBF_RX_HDR, /* received pdu header */
SKCBF_RX_DATA, /* received pdu payload */