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| author | Nicholas Bellinger <nab@linux-iscsi.org> | 2011-11-30 00:41:20 -0800 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2011-12-14 11:42:12 +0000 |
| commit | 40be67f4c588fe2f3e2dbd60ae1f470abc5b6ad8 (patch) | |
| tree | 2651859707dfe779766552cde0fce41f5eb19103 | |
| parent | ec54cc081ead14e85736c6543e36ec59be8a7d3d (diff) | |
| download | linux-40be67f4c588fe2f3e2dbd60ae1f470abc5b6ad8.tar.gz linux-40be67f4c588fe2f3e2dbd60ae1f470abc5b6ad8.tar.bz2 linux-40be67f4c588fe2f3e2dbd60ae1f470abc5b6ad8.zip | |
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: Nicholas Bellinger <nab@linux-iscsi.org>
| -rw-r--r-- | drivers/target/target_core_transport.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index e4389d40c057..1cc7e920ab0b 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -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; } |