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target/user: Don't free expired command when time out

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Which would result in NPE after when userspace connected again.

Expired command would be freed either when handling command(by userspace),
or when device was tearing down

Reviewed-by: Andy Grover <agrover@redhat.com>
Signed-off-by: Sheng Yang <sheng@yasker.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Sheng Yang 2016-02-26 14:59:58 -08:00 committed by Nicholas Bellinger
parent 26418649ee
commit b25c786399
1 changed files with 17 additions and 8 deletions
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25
drivers/target/target_core_user.c
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@ -560,9 +560,13 @@ static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *
struct tcmu_dev *udev = cmd->tcmu_dev;
if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) {
/* cmd has been completed already from timeout, just reclaim data
ring space */
/*
* cmd has been completed already from timeout, just reclaim
* data ring space and free cmd
*/
free_data_area(udev, cmd);
kmem_cache_free(tcmu_cmd_cache, cmd);
return;
}
@ -976,12 +980,12 @@ static int tcmu_configure_device(struct se_device *dev)
return ret;
}
static int tcmu_check_pending_cmd(int id, void *p, void *data)
static int tcmu_check_and_free_pending_cmd(struct tcmu_cmd *cmd)
{
struct tcmu_cmd *cmd = p;
if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags))
if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) {
kmem_cache_free(tcmu_cmd_cache, cmd);
return 0;
}
return -EINVAL;
}
@ -996,6 +1000,8 @@ static void tcmu_dev_call_rcu(struct rcu_head *p)
static void tcmu_free_device(struct se_device *dev)
{
struct tcmu_dev *udev = TCMU_DEV(dev);
struct tcmu_cmd *cmd;
bool all_expired = true;
int i;
del_timer_sync(&udev->timeout);
@ -1004,10 +1010,13 @@ static void tcmu_free_device(struct se_device *dev)
/* Upper layer should drain all requests before calling this */
spin_lock_irq(&udev->commands_lock);
i = idr_for_each(&udev->commands, tcmu_check_pending_cmd, NULL);
idr_for_each_entry(&udev->commands, cmd, i) {
if (tcmu_check_and_free_pending_cmd(cmd) != 0)
all_expired = false;
}
idr_destroy(&udev->commands);
spin_unlock_irq(&udev->commands_lock);
WARN_ON(i);
WARN_ON(!all_expired);
/* Device was configured */
if (udev->uio_info.uio_dev) {