From mboxrd@z Thu Jan 1 00:00:00 1970 From: Colin King Date: Thu, 09 Jul 2020 13:52:17 +0000 Subject: [PATCH][next] scsi: cxgb4i: fix dereference of pointer tdata before it is null checked Message-Id: <20200709135217.1408105-1-colin.king@canonical.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: "James E . J . Bottomley" , "Martin K . Petersen" , Varun Prakash , linux-scsi@vger.kernel.org Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org From: Colin Ian King Currently pointer tdata is being dereferenced on the initialization of pointer skb before tdata is null checked. This could lead to a potential null pointer dereference. Fix this by dereferencing tdata after tdata has been null pointer sanity checked. Addresses-Coverity: ("Dereference before null check") Fixes: e33c2482289b ("scsi: cxgb4i: Add support for iSCSI segmentation offload") Signed-off-by: Colin Ian King --- drivers/scsi/cxgbi/libcxgbi.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/cxgbi/libcxgbi.c b/drivers/scsi/cxgbi/libcxgbi.c index 1fb101c616b7..a6119d9daedf 100644 --- a/drivers/scsi/cxgbi/libcxgbi.c +++ b/drivers/scsi/cxgbi/libcxgbi.c @@ -2147,7 +2147,7 @@ int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset, struct iscsi_conn *conn = task->conn; struct iscsi_tcp_task *tcp_task = task->dd_data; struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task); - struct sk_buff *skb = tdata->skb; + struct sk_buff *skb; struct scsi_cmnd *sc = task->sc; u32 expected_count, expected_offset; u32 datalen = count, dlimit = 0; @@ -2161,6 +2161,7 @@ int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset, tcp_task ? tcp_task->dd_data : NULL, tdata); return -EINVAL; } + skb = tdata->skb; log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX, "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n", @@ -2365,7 +2366,7 @@ int cxgbi_conn_xmit_pdu(struct iscsi_task *task) struct iscsi_tcp_task *tcp_task = task->dd_data; struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task); struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo; - struct sk_buff *skb = tdata->skb; + struct sk_buff *skb; struct cxgbi_sock *csk = NULL; u32 pdulen = 0; u32 datalen; @@ -2378,6 +2379,7 @@ int cxgbi_conn_xmit_pdu(struct iscsi_task *task) return -EINVAL; } + skb = tdata->skb; if (!skb) { log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX, "task 0x%p, skb NULL.\n", task); -- 2.27.0