diff mbox series

[v1,1/5] mpi3mr: synchronize the access to ioctl data buffer

Message ID 20241110194405.10108-2-ranjan.kumar@broadcom.com (mailing list archive)
State New
Headers show
Series mpi3mr: Few Enhancements and minor fixes | expand

Commit Message

Ranjan Kumar Nov. 10, 2024, 7:44 p.m. UTC 
The driver serializes IOCTLs through a mutex lock,
but the access to IOCTL data buffer is not guarded
by the lock.It causes multiple user threads writing
to the driver's ioctl buffer simultaneously.

Access to the IOCTL data buffer is guarded by the IOCTL mutex lock.

Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: Ranjan Kumar <ranjan.kumar@broadcom.com>
---
 drivers/scsi/mpi3mr/mpi3mr_app.c | 36 ++++++++++++++++++++++----------
 1 file changed, 25 insertions(+), 11 deletions(-)
diff mbox series

Patch

diff --git a/drivers/scsi/mpi3mr/mpi3mr_app.c b/drivers/scsi/mpi3mr/mpi3mr_app.c
index 01f035f9330e..10b8e4dc64f8 100644
--- a/drivers/scsi/mpi3mr/mpi3mr_app.c
+++ b/drivers/scsi/mpi3mr/mpi3mr_app.c
@@ -2329,6 +2329,15 @@  static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job)
 	if (!mrioc)
 		return -ENODEV;
 
+	if (mutex_lock_interruptible(&mrioc->bsg_cmds.mutex))
+		return -ERESTARTSYS;
+
+	if (mrioc->bsg_cmds.state & MPI3MR_CMD_PENDING) {
+		dprint_bsg_err(mrioc, "%s: command is in use\n", __func__);
+		mutex_unlock(&mrioc->bsg_cmds.mutex);
+		return -EAGAIN;
+	}
+
 	if (!mrioc->ioctl_sges_allocated) {
 		dprint_bsg_err(mrioc, "%s: DMA memory was not allocated\n",
 			       __func__);
@@ -2339,13 +2348,16 @@  static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job)
 		karg->timeout = MPI3MR_APP_DEFAULT_TIMEOUT;
 
 	mpi_req = kzalloc(MPI3MR_ADMIN_REQ_FRAME_SZ, GFP_KERNEL);
-	if (!mpi_req)
+	if (!mpi_req) {
+		mutex_unlock(&mrioc->bsg_cmds.mutex);
 		return -ENOMEM;
+	}
 	mpi_header = (struct mpi3_request_header *)mpi_req;
 
 	bufcnt = karg->buf_entry_list.num_of_entries;
 	drv_bufs = kzalloc((sizeof(*drv_bufs) * bufcnt), GFP_KERNEL);
 	if (!drv_bufs) {
+		mutex_unlock(&mrioc->bsg_cmds.mutex);
 		rval = -ENOMEM;
 		goto out;
 	}
@@ -2353,6 +2365,7 @@  static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job)
 	dout_buf = kzalloc(job->request_payload.payload_len,
 				      GFP_KERNEL);
 	if (!dout_buf) {
+		mutex_unlock(&mrioc->bsg_cmds.mutex);
 		rval = -ENOMEM;
 		goto out;
 	}
@@ -2360,6 +2373,7 @@  static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job)
 	din_buf = kzalloc(job->reply_payload.payload_len,
 				     GFP_KERNEL);
 	if (!din_buf) {
+		mutex_unlock(&mrioc->bsg_cmds.mutex);
 		rval = -ENOMEM;
 		goto out;
 	}
@@ -2435,6 +2449,7 @@  static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job)
 					(mpi_msg_size > MPI3MR_ADMIN_REQ_FRAME_SZ)) {
 				dprint_bsg_err(mrioc, "%s: invalid MPI message size\n",
 					__func__);
+				mutex_unlock(&mrioc->bsg_cmds.mutex);
 				rval = -EINVAL;
 				goto out;
 			}
@@ -2447,6 +2462,7 @@  static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job)
 		if (invalid_be) {
 			dprint_bsg_err(mrioc, "%s: invalid buffer entries passed\n",
 				__func__);
+			mutex_unlock(&mrioc->bsg_cmds.mutex);
 			rval = -EINVAL;
 			goto out;
 		}
@@ -2454,12 +2470,14 @@  static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job)
 		if (sgl_dout_iter > (dout_buf + job->request_payload.payload_len)) {
 			dprint_bsg_err(mrioc, "%s: data_out buffer length mismatch\n",
 				       __func__);
+			mutex_unlock(&mrioc->bsg_cmds.mutex);
 			rval = -EINVAL;
 			goto out;
 		}
 		if (sgl_din_iter > (din_buf + job->reply_payload.payload_len)) {
 			dprint_bsg_err(mrioc, "%s: data_in buffer length mismatch\n",
 				       __func__);
+			mutex_unlock(&mrioc->bsg_cmds.mutex);
 			rval = -EINVAL;
 			goto out;
 		}
@@ -2472,6 +2490,7 @@  static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job)
 		dprint_bsg_err(mrioc, "%s:%d: invalid data transfer size passed for function 0x%x din_size = %d, dout_size = %d\n",
 			       __func__, __LINE__, mpi_header->function, din_size,
 			       dout_size);
+		mutex_unlock(&mrioc->bsg_cmds.mutex);
 		rval = -EINVAL;
 		goto out;
 	}
@@ -2480,6 +2499,7 @@  static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job)
 		dprint_bsg_err(mrioc,
 		    "%s:%d: invalid data transfer size passed for function 0x%x din_size=%d\n",
 		    __func__, __LINE__, mpi_header->function, din_size);
+		mutex_unlock(&mrioc->bsg_cmds.mutex);
 		rval = -EINVAL;
 		goto out;
 	}
@@ -2487,6 +2507,7 @@  static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job)
 		dprint_bsg_err(mrioc,
 		    "%s:%d: invalid data transfer size passed for function 0x%x dout_size = %d\n",
 		    __func__, __LINE__, mpi_header->function, dout_size);
+		mutex_unlock(&mrioc->bsg_cmds.mutex);
 		rval = -EINVAL;
 		goto out;
 	}
@@ -2497,6 +2518,7 @@  static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job)
 			dprint_bsg_err(mrioc, "%s:%d: invalid message size passed:%d:%d:%d:%d\n",
 				       __func__, __LINE__, din_cnt, dout_cnt, din_size,
 			    dout_size);
+			mutex_unlock(&mrioc->bsg_cmds.mutex);
 			rval = -EINVAL;
 			goto out;
 		}
@@ -2544,6 +2566,7 @@  static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job)
 				continue;
 			if (mpi3mr_map_data_buffer_dma(mrioc, drv_buf_iter, desc_count)) {
 				rval = -ENOMEM;
+				mutex_unlock(&mrioc->bsg_cmds.mutex);
 				dprint_bsg_err(mrioc, "%s:%d: mapping data buffers failed\n",
 					       __func__, __LINE__);
 			goto out;
@@ -2556,20 +2579,11 @@  static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job)
 		sense_buff_k = kzalloc(erbsz, GFP_KERNEL);
 		if (!sense_buff_k) {
 			rval = -ENOMEM;
+			mutex_unlock(&mrioc->bsg_cmds.mutex);
 			goto out;
 		}
 	}
 
-	if (mutex_lock_interruptible(&mrioc->bsg_cmds.mutex)) {
-		rval = -ERESTARTSYS;
-		goto out;
-	}
-	if (mrioc->bsg_cmds.state & MPI3MR_CMD_PENDING) {
-		rval = -EAGAIN;
-		dprint_bsg_err(mrioc, "%s: command is in use\n", __func__);
-		mutex_unlock(&mrioc->bsg_cmds.mutex);
-		goto out;
-	}
 	if (mrioc->unrecoverable) {
 		dprint_bsg_err(mrioc, "%s: unrecoverable controller\n",
 		    __func__);