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Fix race between queueing the pdu and update the task data

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After we have called iscsi_queue_pdu from iscsi_scsi_command_async
the pdu might have already completed if we are using multithreading
so we should not dereference pdu at that point.

Move the assignment of task->cmdsn and task->itt we need for
task management into iscsi_pdu_set_cmdsn instead.

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
This commit is contained in:
Ronnie Sahlberg
2025-04-26 11:55:47 +10:00
parent d5e3bf6175
commit eb19863f77
3 changed files with 7 additions and 6 deletions
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6
lib/iscsi-command.c
View File

@@ -267,6 +267,7 @@ iscsi_scsi_command_async(struct iscsi_context *iscsi, int lun,
/* lun */
iscsi_pdu_set_lun(pdu, lun);
pdu->lun = lun;
task->lun = lun;
/* expxferlen */
iscsi_pdu_set_expxferlen(pdu, task->expxferlen);
@@ -290,11 +291,6 @@ iscsi_scsi_command_async(struct iscsi_context *iscsi, int lun,
iscsi_send_unsolicited_data_out(iscsi, pdu);
}
/* remember cmdsn and itt so we can use task management */
task->cmdsn = pdu->cmdsn;
task->itt = pdu->itt;
task->lun = lun;
return 0;
}

5
lib/pdu.c
View File

@@ -800,6 +800,11 @@ iscsi_pdu_set_cmdsn(struct iscsi_pdu *pdu, uint32_t cmdsn)
{
scsi_set_uint32(&pdu->outdata.data[24], cmdsn);
pdu->cmdsn = cmdsn;
if (pdu->scsi_cbdata.task) {
/* remember cmdsn and itt so we can use task management */
pdu->scsi_cbdata.task->cmdsn = pdu->cmdsn;
pdu->scsi_cbdata.task->itt = pdu->itt;
}
}
void

2
lib/socket.c
View File

@@ -149,7 +149,7 @@ iscsi_add_to_outqueue(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
finished:
iscsi_mt_spin_unlock(&iscsi->iscsi_lock);
/* TODO QQQ need to immediately send for the non multithreading case too
* and for the Windows API too */
#if defined(HAVE_MULTITHREADING) && defined(HAVE_PTHREAD)