Commit 40be67f4 authored by Nicholas Bellinger's avatar Nicholas Bellinger

target: Fix possible NULL pointer with __transport_execute_tasks

This patch makes __transport_execute_tasks() use a local *se_dev
reference to prevent direct se_cmd->se_dev access after
transport_cmd_check_stop() -> transport_add_tasks_from_cmd()
has been called, as in the current implementation we can expect
__transport_execute_tasks() may be called from another context
that may have already completed the I/O.

Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
parent ec54cc08
......@@ -2076,6 +2076,7 @@ static inline int transport_execute_task_attr(struct se_cmd *cmd)
static int transport_execute_tasks(struct se_cmd *cmd)
{
int add_tasks;
struct se_device *se_dev = cmd->se_dev;
if (se_dev_check_online(cmd->se_dev) != 0) {
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
......@@ -2108,7 +2109,7 @@ static int transport_execute_tasks(struct se_cmd *cmd)
* storage object.
*/
execute_tasks:
__transport_execute_tasks(cmd->se_dev);
__transport_execute_tasks(se_dev);
return 0;
}
......
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