linux-kernel - [PATCH v4] staging: rts5208: add error handling into rtsx

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Date:   Tue, 19 Jun 2018 18:25:24 +0300
From:   Anton Vasilyev <vasilyev@...ras.ru>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Anton Vasilyev <vasilyev@...ras.ru>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Sinan Kaya <okaya@...eaurora.org>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        Gaurav Pathak <gauravpathak129@...il.com>,
        Hannes Reinecke <hare@...e.de>, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: [PATCH v4] staging: rts5208: add error handling into rtsx_probe

If rtsx_probe() fails to allocate dev->chip, then release_everything()
will crash on uninitialized dev->cmnd_ready complete

Patch adds error handling into rtsx_probe.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Anton Vasilyev <vasilyev@...ras.ru>
---
v4: rename labels baced on Dan Carpenter's recommendation
v3: fix subject and commit message
v2: Add error handling into rtsx_probe based on Dan Carpenter's comment.
I do not have corresponding hardware, so patch was tested by compilation only.

I faced with inaccuracy at rtsx_remove() and original rtsx_probe():
there is quiesce_and_remove_host() call with scsi_remove_host() inside,
whereas release_everything() calls scsi_host_put() after this
scsi_remove_host() call. This is strange for me.
Also I do not know is it require to check result value of
rtsx_init_chip() call on rtsx_probe().
---
 drivers/staging/rts5208/rtsx.c | 34 ++++++++++++++++++++++++----------
 1 file changed, 24 insertions(+), 10 deletions(-)

diff --git a/drivers/staging/rts5208/rtsx.c b/drivers/staging/rts5208/rtsx.c
index 70e0b8623110..233026ee5dd4 100644
--- a/drivers/staging/rts5208/rtsx.c
+++ b/drivers/staging/rts5208/rtsx.c
@@ -879,7 +879,7 @@ static int rtsx_probe(struct pci_dev *pci,
 	if (!dev->remap_addr) {
 		dev_err(&pci->dev, "ioremap error\n");
 		err = -ENXIO;
-		goto errout;
+		goto err_chip_free;
 	}
 
 	/*
@@ -894,7 +894,7 @@ static int rtsx_probe(struct pci_dev *pci,
 	if (!dev->rtsx_resv_buf) {
 		dev_err(&pci->dev, "alloc dma buffer fail\n");
 		err = -ENXIO;
-		goto errout;
+		goto err_addr_unmap;
 	}
 	dev->chip->host_cmds_ptr = dev->rtsx_resv_buf;
 	dev->chip->host_cmds_addr = dev->rtsx_resv_buf_addr;
@@ -915,7 +915,7 @@ static int rtsx_probe(struct pci_dev *pci,
 
 	if (rtsx_acquire_irq(dev) < 0) {
 		err = -EBUSY;
-		goto errout;
+		goto err_disable_msi;
 	}
 
 	pci_set_master(pci);
@@ -935,14 +935,14 @@ static int rtsx_probe(struct pci_dev *pci,
 	if (IS_ERR(th)) {
 		dev_err(&pci->dev, "Unable to start control thread\n");
 		err = PTR_ERR(th);
-		goto errout;
+		goto err_rtsx_release;
 	}
 	dev->ctl_thread = th;
 
 	err = scsi_add_host(host, &pci->dev);
 	if (err) {
 		dev_err(&pci->dev, "Unable to add the scsi host\n");
-		goto errout;
+		goto err_complete_control_thread;
 	}
 
 	/* Start up the thread for delayed SCSI-device scanning */
@@ -950,18 +950,16 @@ static int rtsx_probe(struct pci_dev *pci,
 	if (IS_ERR(th)) {
 		dev_err(&pci->dev, "Unable to start the device-scanning thread\n");
 		complete(&dev->scanning_done);
-		quiesce_and_remove_host(dev);
 		err = PTR_ERR(th);
-		goto errout;
+		goto err_stop_host;
 	}
 
 	/* Start up the thread for polling thread */
 	th = kthread_run(rtsx_polling_thread, dev, "rtsx-polling");
 	if (IS_ERR(th)) {
 		dev_err(&pci->dev, "Unable to start the device-polling thread\n");
-		quiesce_and_remove_host(dev);
 		err = PTR_ERR(th);
-		goto errout;
+		goto err_stop_host;
 	}
 	dev->polling_thread = th;
 
@@ -970,9 +968,25 @@ static int rtsx_probe(struct pci_dev *pci,
 	return 0;
 
 	/* We come here if there are any problems */
+err_stop_host:
+	quiesce_and_remove_host(dev);
+err_complete_control_thread:
+	complete(&dev->cmnd_ready);
+	wait_for_completion(&dev->control_exit);
+err_rtsx_release:
+	free_irq(dev->irq, (void *)dev);
+	rtsx_release_chip(dev->chip);
+err_disable_msi:
+	dev->chip->host_cmds_ptr = NULL;
+	dev->chip->host_sg_tbl_ptr = NULL;
+	if (dev->chip->msi_en)
+		pci_disable_msi(dev->pci);
+err_addr_unmap:
+	iounmap(dev->remap_addr);
+err_chip_free:
+	kfree(dev->chip);
 errout:
 	dev_err(&pci->dev, "%s failed\n", __func__);
-	release_everything(dev);
 
 	return err;
 }
-- 
2.17.1