The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.4.y git checkout FETCH_HEAD git cherry-pick -x b843adde8d490934d042fbe9e3e46697cb3a64d2 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2023072125-educator-unroll-251d@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^..
Possible dependencies:
b843adde8d49 ("scsi: qla2xxx: Fix mem access after free") d3affdeb400f ("scsi: qla2xxx: Synchronize the IOCB count to be in order") c39587bc0aba ("scsi: qla2xxx: Fix crash due to stale SRB access around I/O timeouts") 5597616333ea ("scsi: qla2xxx: Stop using the SCSI pointer") 79e30b884a01 ("scsi: qla2xxx: Call scsi_done() directly") e56b2234ab64 ("scsi: qla2xxx: Open-code qla2xxx_eh_target_reset()") 622299f16f33 ("scsi: qla2xxx: Simplify return value logic in qla2x00_get_sp_from_handle()") f45bca8c5052 ("scsi: qla2xxx: Fix double scsi_done for abort path")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From b843adde8d490934d042fbe9e3e46697cb3a64d2 Mon Sep 17 00:00:00 2001 From: Quinn Tran qutran@marvell.com Date: Fri, 28 Apr 2023 00:53:37 -0700 Subject: [PATCH] scsi: qla2xxx: Fix mem access after free
System crash, where driver is accessing scsi layer's memory (scsi_cmnd->device->host) to search for a well known internal pointer (vha). The scsi_cmnd was released back to upper layer which could be freed, but the driver is still accessing it.
7 [ffffa8e8d2c3f8d0] page_fault at ffffffff86c010fe [exception RIP: __qla2x00_eh_wait_for_pending_commands+240] RIP: ffffffffc0642350 RSP: ffffa8e8d2c3f988 RFLAGS: 00010286 RAX: 0000000000000165 RBX: 0000000000000002 RCX: 00000000000036d8 RDX: 0000000000000000 RSI: ffff9c5c56535188 RDI: 0000000000000286 RBP: ffff9c5bf7aa4a58 R8: ffff9c589aecdb70 R9: 00000000000003d1 R10: 0000000000000001 R11: 0000000000380000 R12: ffff9c5c5392bc78 R13: ffff9c57044ff5c0 R14: ffff9c56b5a3aa00 R15: 00000000000006db ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018 8 [ffffa8e8d2c3f9c8] qla2x00_eh_wait_for_pending_commands at ffffffffc0646dd5 [qla2xxx] 9 [ffffa8e8d2c3fa00] __qla2x00_async_tm_cmd at ffffffffc0658094 [qla2xxx]
Remove access of freed memory. Currently the driver was checking to see if scsi_done was called by seeing if the sp->type has changed. Instead, check to see if the command has left the oustanding_cmds[] array as sign of scsi_done was called.
Cc: stable@vger.kernel.org Signed-off-by: Quinn Tran qutran@marvell.com Signed-off-by: Nilesh Javali njavali@marvell.com Link: https://lore.kernel.org/r/20230428075339.32551-6-njavali@marvell.com Reviewed-by: Himanshu Madhani himanshu.madhani@oracle.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com
diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c index f3107508cf12..a07c010b0843 100644 --- a/drivers/scsi/qla2xxx/qla_isr.c +++ b/drivers/scsi/qla2xxx/qla_isr.c @@ -1862,9 +1862,9 @@ qla2x00_process_completed_request(struct scsi_qla_host *vha, } }
-srb_t * -qla2x00_get_sp_from_handle(scsi_qla_host_t *vha, const char *func, - struct req_que *req, void *iocb) +static srb_t * +qla_get_sp_from_handle(scsi_qla_host_t *vha, const char *func, + struct req_que *req, void *iocb, u16 *ret_index) { struct qla_hw_data *ha = vha->hw; sts_entry_t *pkt = iocb; @@ -1899,12 +1899,25 @@ qla2x00_get_sp_from_handle(scsi_qla_host_t *vha, const char *func, return NULL; }
- req->outstanding_cmds[index] = NULL; - + *ret_index = index; qla_put_fw_resources(sp->qpair, &sp->iores); return sp; }
+srb_t * +qla2x00_get_sp_from_handle(scsi_qla_host_t *vha, const char *func, + struct req_que *req, void *iocb) +{ + uint16_t index; + srb_t *sp; + + sp = qla_get_sp_from_handle(vha, func, req, iocb, &index); + if (sp) + req->outstanding_cmds[index] = NULL; + + return sp; +} + static void qla2x00_mbx_iocb_entry(scsi_qla_host_t *vha, struct req_que *req, struct mbx_entry *mbx) @@ -3237,13 +3250,13 @@ qla2x00_status_entry(scsi_qla_host_t *vha, struct rsp_que *rsp, void *pkt) return; }
- req->outstanding_cmds[handle] = NULL; cp = GET_CMD_SP(sp); if (cp == NULL) { ql_dbg(ql_dbg_io, vha, 0x3018, "Command already returned (0x%x/%p).\n", sts->handle, sp);
+ req->outstanding_cmds[handle] = NULL; return; }
@@ -3514,6 +3527,9 @@ qla2x00_status_entry(scsi_qla_host_t *vha, struct rsp_que *rsp, void *pkt)
if (rsp->status_srb == NULL) sp->done(sp, res); + + /* for io's, clearing of outstanding_cmds[handle] means scsi_done was called */ + req->outstanding_cmds[handle] = NULL; }
/** @@ -3590,6 +3606,7 @@ qla2x00_error_entry(scsi_qla_host_t *vha, struct rsp_que *rsp, sts_entry_t *pkt) uint16_t que = MSW(pkt->handle); struct req_que *req = NULL; int res = DID_ERROR << 16; + u16 index;
ql_dbg(ql_dbg_async, vha, 0x502a, "iocb type %xh with error status %xh, handle %xh, rspq id %d\n", @@ -3608,7 +3625,6 @@ qla2x00_error_entry(scsi_qla_host_t *vha, struct rsp_que *rsp, sts_entry_t *pkt)
switch (pkt->entry_type) { case NOTIFY_ACK_TYPE: - case STATUS_TYPE: case STATUS_CONT_TYPE: case LOGINOUT_PORT_IOCB_TYPE: case CT_IOCB_TYPE: @@ -3628,6 +3644,14 @@ qla2x00_error_entry(scsi_qla_host_t *vha, struct rsp_que *rsp, sts_entry_t *pkt) case CTIO_TYPE7: case CTIO_CRC2: return 1; + case STATUS_TYPE: + sp = qla_get_sp_from_handle(vha, func, req, pkt, &index); + if (sp) { + sp->done(sp, res); + req->outstanding_cmds[index] = NULL; + return 0; + } + break; } fatal: ql_log(ql_log_warn, vha, 0x5030, diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c index 2fa695bf38b7..bc89d3da8fd0 100644 --- a/drivers/scsi/qla2xxx/qla_os.c +++ b/drivers/scsi/qla2xxx/qla_os.c @@ -1078,43 +1078,6 @@ qla2xxx_mqueuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd, return 0; }
-/* - * qla2x00_eh_wait_on_command - * Waits for the command to be returned by the Firmware for some - * max time. - * - * Input: - * cmd = Scsi Command to wait on. - * - * Return: - * Completed in time : QLA_SUCCESS - * Did not complete in time : QLA_FUNCTION_FAILED - */ -static int -qla2x00_eh_wait_on_command(struct scsi_cmnd *cmd) -{ -#define ABORT_POLLING_PERIOD 1000 -#define ABORT_WAIT_ITER ((2 * 1000) / (ABORT_POLLING_PERIOD)) - unsigned long wait_iter = ABORT_WAIT_ITER; - scsi_qla_host_t *vha = shost_priv(cmd->device->host); - struct qla_hw_data *ha = vha->hw; - srb_t *sp = scsi_cmd_priv(cmd); - int ret = QLA_SUCCESS; - - if (unlikely(pci_channel_offline(ha->pdev)) || ha->flags.eeh_busy) { - ql_dbg(ql_dbg_taskm, vha, 0x8005, - "Return:eh_wait.\n"); - return ret; - } - - while (sp->type && wait_iter--) - msleep(ABORT_POLLING_PERIOD); - if (sp->type) - ret = QLA_FUNCTION_FAILED; - - return ret; -} - /* * qla2x00_wait_for_hba_online * Wait till the HBA is online after going through @@ -1365,6 +1328,9 @@ qla2xxx_eh_abort(struct scsi_cmnd *cmd) return ret; }
+#define ABORT_POLLING_PERIOD 1000 +#define ABORT_WAIT_ITER ((2 * 1000) / (ABORT_POLLING_PERIOD)) + /* * Returns: QLA_SUCCESS or QLA_FUNCTION_FAILED. */ @@ -1378,41 +1344,73 @@ __qla2x00_eh_wait_for_pending_commands(struct qla_qpair *qpair, unsigned int t, struct req_que *req = qpair->req; srb_t *sp; struct scsi_cmnd *cmd; + unsigned long wait_iter = ABORT_WAIT_ITER; + bool found; + struct qla_hw_data *ha = vha->hw;
status = QLA_SUCCESS;
- spin_lock_irqsave(qpair->qp_lock_ptr, flags); - for (cnt = 1; status == QLA_SUCCESS && - cnt < req->num_outstanding_cmds; cnt++) { - sp = req->outstanding_cmds[cnt]; - if (!sp) - continue; - if (sp->type != SRB_SCSI_CMD) - continue; - if (vha->vp_idx != sp->vha->vp_idx) - continue; - match = 0; - cmd = GET_CMD_SP(sp); - switch (type) { - case WAIT_HOST: - match = 1; - break; - case WAIT_TARGET: - match = cmd->device->id == t; - break; - case WAIT_LUN: - match = (cmd->device->id == t && - cmd->device->lun == l); - break; - } - if (!match) - continue; + while (wait_iter--) { + found = false;
- spin_unlock_irqrestore(qpair->qp_lock_ptr, flags); - status = qla2x00_eh_wait_on_command(cmd); spin_lock_irqsave(qpair->qp_lock_ptr, flags); + for (cnt = 1; cnt < req->num_outstanding_cmds; cnt++) { + sp = req->outstanding_cmds[cnt]; + if (!sp) + continue; + if (sp->type != SRB_SCSI_CMD) + continue; + if (vha->vp_idx != sp->vha->vp_idx) + continue; + match = 0; + cmd = GET_CMD_SP(sp); + switch (type) { + case WAIT_HOST: + match = 1; + break; + case WAIT_TARGET: + if (sp->fcport) + match = sp->fcport->d_id.b24 == t; + else + match = 0; + break; + case WAIT_LUN: + if (sp->fcport) + match = (sp->fcport->d_id.b24 == t && + cmd->device->lun == l); + else + match = 0; + break; + } + if (!match) + continue; + + spin_unlock_irqrestore(qpair->qp_lock_ptr, flags); + + if (unlikely(pci_channel_offline(ha->pdev)) || + ha->flags.eeh_busy) { + ql_dbg(ql_dbg_taskm, vha, 0x8005, + "Return:eh_wait.\n"); + return status; + } + + /* + * SRB_SCSI_CMD is still in the outstanding_cmds array. + * it means scsi_done has not called. Wait for it to + * clear from outstanding_cmds. + */ + msleep(ABORT_POLLING_PERIOD); + spin_lock_irqsave(qpair->qp_lock_ptr, flags); + found = true; + } + spin_unlock_irqrestore(qpair->qp_lock_ptr, flags); + + if (!found) + break; } - spin_unlock_irqrestore(qpair->qp_lock_ptr, flags); + + if (!wait_iter && found) + status = QLA_FUNCTION_FAILED;
return status; }