tcm_fc: Add abort flag for gracefully handling exchange timeout

Add abort flag and use it to terminate processing when an exchange
is timed out or is reset. The abort flag is used in place of the
transport_generic_free_cmd function call in the reset and timeout
cases, because calling that function in that context would free
memory that was in use. The aborted flag allows the lifetime to
be managed in a more normal way, while truncating the processing.

This change eliminates a source of memory corruption which
manifested in a variety of ugly ways.

(nab: Drop unused struct fc_exch *ep in ft_recv_seq)

Signed-off-by: Mark Rustad <mark.d.rustad@intel.com>
Acked-by: Kiran Patil <Kiran.patil@intel.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

3 files changed, 11 insertions, 2 deletions

diff --git a/drivers/target/tcm_fc/tcm_fc.h b/drivers/target/tcm_fc/tcm_fc.h
index 8306579..c5eb3c3 100644
--- a/drivers/target/tcm_fc/tcm_fc.h
+++ b/drivers/target/tcm_fc/tcm_fc.h
@@ -122,6 +122,7 @@ struct ft_cmd {
 	/* Local sense buffer */
 	unsigned char ft_sense_buffer[TRANSPORT_SENSE_BUFFER];
 	u32 was_ddp_setup:1;		/* Set only if ddp is setup */
+	u32 aborted:1;			/* Set if aborted by reset or timeout */
 	struct scatterlist *sg;		/* Set only if DDP is setup */
 	u32 sg_cnt;			/* No. of item in scatterlist */
 };
diff --git a/drivers/target/tcm_fc/tfc_cmd.c b/drivers/target/tcm_fc/tfc_cmd.c
index 62dec97..a375f25 100644
--- a/drivers/target/tcm_fc/tfc_cmd.c
+++ b/drivers/target/tcm_fc/tfc_cmd.c
@@ -121,6 +121,8 @@ int ft_queue_status(struct se_cmd *se_cmd)
 	struct fc_exch *ep;
 	size_t len;
 
+	if (cmd->aborted)
+		return 0;
 	ft_dump_cmd(cmd, __func__);
 	ep = fc_seq_exch(cmd->seq);
 	lport = ep->lp;
@@ -187,6 +189,8 @@ int ft_write_pending(struct se_cmd *se_cmd)
 
 	ft_dump_cmd(cmd, __func__);
 
+	if (cmd->aborted)
+		return 0;
 	ep = fc_seq_exch(cmd->seq);
 	lport = ep->lp;
 	fp = fc_frame_alloc(lport, sizeof(*txrdy));
@@ -252,10 +256,10 @@ static void ft_recv_seq(struct fc_seq *sp, struct fc_frame *fp, void *arg)
 	struct ft_cmd *cmd = arg;
 	struct fc_frame_header *fh;
 
-	if (IS_ERR(fp)) {
+	if (unlikely(IS_ERR(fp))) {
 		/* XXX need to find cmd if queued */
 		cmd->seq = NULL;
-		transport_generic_free_cmd(&cmd->se_cmd, 0);
+		cmd->aborted = true;
 		return;
 	}
 
@@ -399,6 +403,8 @@ int ft_queue_tm_resp(struct se_cmd *se_cmd)
 	struct se_tmr_req *tmr = se_cmd->se_tmr_req;
 	enum fcp_resp_rsp_codes code;
 
+	if (cmd->aborted)
+		return 0;
 	switch (tmr->response) {
 	case TMR_FUNCTION_COMPLETE:
 		code = FCP_TMF_CMPL;
diff --git a/drivers/target/tcm_fc/tfc_io.c b/drivers/target/tcm_fc/tfc_io.c
index 2b693ee..dc7c0db 100644
--- a/drivers/target/tcm_fc/tfc_io.c
+++ b/drivers/target/tcm_fc/tfc_io.c
@@ -81,6 +81,8 @@ int ft_queue_data_in(struct se_cmd *se_cmd)
 	void *from;
 	void *to = NULL;
 
+	if (cmd->aborted)
+		return 0;
 	ep = fc_seq_exch(cmd->seq);
 	lport = ep->lp;
 	cmd->seq = lport->tt.seq_start_next(cmd->seq);