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[PATCH 3.10 52/54] dm cache: fix NULL pointer when switching from cleaner policy

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3.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Joe Thornber <ejt@redhat.com>

commit 2bffa1503c5c06192eb1459180fac4416575a966 upstream.

The cleaner policy doesn't make use of the per cache block hint space in
the metadata (unlike the other policies).  When switching from the
cleaner policy to mq or smq a NULL pointer crash (in dm_tm_new_block)
was observed.  The crash was caused by bugs in dm-cache-metadata.c
when trying to skip creation of the hint btree.

The minimal fix is to change hint size for the cleaner policy to 4 bytes
(only hint size supported).

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/md/dm-cache-policy-cleaner.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/md/dm-cache-policy-cleaner.c
+++ b/drivers/md/dm-cache-policy-cleaner.c
@@ -434,7 +434,7 @@ static struct dm_cache_policy *wb_create
 static struct dm_cache_policy_type wb_policy_type = {
 	.name = "cleaner",
 	.version = {1, 0, 0},
-	.hint_size = 0,
+	.hint_size = 4,
 	.owner = THIS_MODULE,
 	.create = wb_create
 };


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[PATCH 3.10 00/54] 3.10.91-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:00 +0200
  [PATCH 3.10 43/54] IB/qib: Change lkey table allocation to support more MRs Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:00 +0200
  [PATCH 3.10 18/54] dm btree: add ref counting ops for the leaves of top level btrees Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:00 +0200
  [PATCH 3.10 27/54] usb: xhci: Add support for URB_ZERO_PACKET to bulk/sg transfers Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:00 +0200
  [PATCH 3.10 20/54] dm raid: fix round up of default region size Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:00 +0200
  [PATCH 3.10 40/54] powerpc/MSI: Fix race condition in tearing down MSI interrupts Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:00 +0200
  [PATCH 3.10 33/54] regmap: debugfs: Dont bother actually printing when calculating max length Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:00 +0200
  [PATCH 3.10 30/54] ipvs: fix crash with sync protocol v0 and FTP Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:00 +0200
  [PATCH 3.10 38/54] MIPS: dma-default: Fix 32-bit fall back to GFP_DMA Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:00 +0200
  [PATCH 3.10 48/54] bonding: correct the MAC address for "follow"  fail_over_mac policy Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:00 +0200
  [PATCH 3.10 36/54] usb: Add device quirk for Logitech PTZ cameras Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:00 +0200
  [PATCH 3.10 31/54] udf: Check length of extended attributes and allocation descriptors Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:00 +0200
  [PATCH 3.10 19/54] USB: option: add ZTE PIDs Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:00 +0200
  [PATCH 3.10 05/54] x86/apic: Serialize LVTT and TSC_DEADLINE writes Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:00 +0200
  [PATCH 3.10 06/54] x86/platform: Fix Geode LX timekeeping in the generic x86 build Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:10 +0200
  [PATCH 3.10 09/54] x86/xen: Support kexec/kdump in HVM guests by doing a soft reset Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:10 +0200
  [PATCH 3.10 07/54] Use WARN_ON_ONCE for missing X86_FEATURE_NRIPS Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:10 +0200
  [PATCH 3.10 08/54] x86/mm: Set NX on gap between __ex_table and rodata Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:10 +0200
  [PATCH 3.10 24/54] USB: whiteheat: fix potential null-deref at probe Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:30 +0200
  [PATCH 3.10 21/54] netfilter: nf_conntrack: Support expectations in different zones Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:30 +0200
  [PATCH 3.10 26/54] xhci: change xhci 1.0 only restrictions to support xhci 1.1 Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:30 +0200
  [PATCH 3.10 25/54] usb: xhci: Clear XHCI_STATE_DYING on start Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:30 +0200
  [PATCH 3.10 50/54] genirq: Fix race in register_irq_proc() Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:30 +0200
  [PATCH 3.10 17/54] staging: comedi: adl_pci7x3x: fix digital output on PCI-7230 Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:30 +0200
  [PATCH 3.10 22/54] disabling oplocks/leases via module parm enable_oplocks broken for SMB3 Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:30 +0200
  [PATCH 3.10 23/54] drm: Reject DRI1 hw lock ioctl functions for kms drivers Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:30 +0200
  [PATCH 3.10 52/54] dm cache: fix NULL pointer when switching from cleaner policy Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:30 +0200
  [PATCH 3.10 53/54] staging: speakup: fix speakup-r regression Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:30 +0200
  [PATCH 3.10 51/54] x86: Add 1/2/4/8 byte optimization to 64bit __copy_{from,to}_user_inatomic Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:30 +0200
  [PATCH 3.10 02/54] perf header: Fixup reading of HEADER_NRCPUS feature Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:40 +0200
  [PATCH 3.10 01/54] scsi: fix scsi_error_handler vs. scsi_host_dev_release race Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:40 +0200
  [PATCH 3.10 03/54] ARM: 8429/1: disable GCC SRA optimization Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:40 +0200
  [PATCH 3.10 16/54] btrfs: skip waiting on ordered range for special files Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:40 +0200
  [PATCH 3.10 10/54] spi: Fix documentation of spi_alloc_master() Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:40 +0200
  [PATCH 3.10 14/54] ASoC: fix broken pxa SoC support Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:40 +0200
  [PATCH 3.10 13/54] ALSA: synth: Fix conflicting OSS device registration on AWE32 Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:40 +0200
  [PATCH 3.10 15/54] ASoC: dwc: correct irq clear method Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:40 +0200
  [PATCH 3.10 04/54] windfarm: decrement client count when unregistering Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:40 +0200
  [PATCH 3.10 11/54] spi: spi-pxa2xx: Check status register to determine if SSSR_TINT is disabled Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 05:50 +0200
  Re: [PATCH 3.10 00/54] 3.10.91-stable review Willy Tarreau <w@1wt.eu> - 2015-10-18 09:10 +0200
    Re: [PATCH 3.10 00/54] 3.10.91-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 18:10 +0200
      Re: [PATCH 3.10 00/54] 3.10.91-stable review Willy Tarreau <w@1wt.eu> - 2015-10-18 21:20 +0200
        Re: [PATCH 3.10 00/54] 3.10.91-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 21:40 +0200
  Re: [PATCH 3.10 00/54] 3.10.91-stable review Guenter Roeck <linux@roeck-us.net> - 2015-10-19 06:10 +0200
    Re: [PATCH 3.10 00/54] 3.10.91-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-19 17:20 +0200
  Re: [PATCH 3.10 00/54] 3.10.91-stable review Shuah Khan <shuahkh@osg.samsung.com> - 2015-10-19 17:20 +0200
    Re: [PATCH 3.10 00/54] 3.10.91-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-22 23:40 +0200

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