linux-kernel - [PATCH] scsi: mptfusion: Fix null pointer dereferences in mptscsih

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Date:   Thu, 22 Oct 2020 11:00:05 +0200
From:   Helge Deller <deller@....de>
To:     Sathya Prakash <sathya.prakash@...adcom.com>,
        Sreekanth Reddy <sreekanth.reddy@...adcom.com>,
        Suganath Prabu Subramani 
        <suganath-prabu.subramani@...adcom.com>,
        MPT-FusionLinux.pdl@...adcom.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     linux-parisc@...r.kernel.org,
        James Bottomley <James.Bottomley@...senpartnership.com>
Subject: [PATCH] scsi: mptfusion: Fix null pointer dereferences in
 mptscsih_remove()

The mptscsih_remove() function triggers a kernel oops if the
Scsi_Host pointer (ioc->sh) is NULL, as can be seen in this syslog:

 ioc0: LSI53C1030 B2: Capabilities={Initiator,Target}
 Begin: Waiting for root file system ...
 scsi host2: error handler thread failed to spawn, error = -4
 mptspi: ioc0: WARNING - Unable to register controller with SCSI subsystem
 Backtrace:
  [<000000001045b7cc>] mptspi_probe+0x248/0x3d0 [mptspi]
  [<0000000040946470>] pci_device_probe+0x1ac/0x2d8
  [<0000000040add668>] really_probe+0x1bc/0x988
  [<0000000040ade704>] driver_probe_device+0x160/0x218
  [<0000000040adee24>] device_driver_attach+0x160/0x188
  [<0000000040adef90>] __driver_attach+0x144/0x320
  [<0000000040ad7c78>] bus_for_each_dev+0xd4/0x158
  [<0000000040adc138>] driver_attach+0x4c/0x80
  [<0000000040adb3ec>] bus_add_driver+0x3e0/0x498
  [<0000000040ae0130>] driver_register+0xf4/0x298
  [<00000000409450c4>] __pci_register_driver+0x78/0xa8
  [<000000000007d248>] mptspi_init+0x18c/0x1c4 [mptspi]

This patch adds the necessary NULL-pointer checks.
Successfully tested on a HP C8000 parisc workstation with buggy SCSI drives.

Signed-off-by: Helge Deller <deller@....de>
Cc: <stable@...r.kernel.org>

diff --git a/drivers/message/fusion/mptscsih.c b/drivers/message/fusion/mptscsih.c
index 8543f0324d5a..0d1b2b0eb843 100644
--- a/drivers/message/fusion/mptscsih.c
+++ b/drivers/message/fusion/mptscsih.c
@@ -1176,8 +1176,10 @@ mptscsih_remove(struct pci_dev *pdev)
 	MPT_SCSI_HOST		*hd;
 	int sz1;

-	if((hd = shost_priv(host)) == NULL)
-		return;
+	if (host == NULL)
+		hd = NULL;
+	else
+		hd = shost_priv(host);

 	mptscsih_shutdown(pdev);

@@ -1193,14 +1195,15 @@ mptscsih_remove(struct pci_dev *pdev)
 	    "Free'd ScsiLookup (%d) memory\n",
 	    ioc->name, sz1));

-	kfree(hd->info_kbuf);
+	if (hd)
+		kfree(hd->info_kbuf);

 	/* NULL the Scsi_Host pointer
 	 */
 	ioc->sh = NULL;

-	scsi_host_put(host);
-
+	if (host)
+		scsi_host_put(host);
 	mpt_detach(pdev);

 }