Jiang Liu a4eaa86c0c iommu/vt-d: Check for NULL pointer when freeing IOMMU data structure ... Domain id 0 will be assigned to invalid translation without allocating domain data structure if DMAR unit supports caching mode. So in function free_dmar_iommu(), we should check whether the domain pointer is NULL, otherwise it will cause system crash as below: [ 6.790519] BUG: unable to handle kernel NULL pointer dereference at 00000000000000c8 [ 6.799520] IP: [<ffffffff810e2dc8>] __lock_acquire+0x11f8/0x1430 [ 6.806493] PGD 0 [ 6.817972] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC [ 6.823303] Modules linked in: [ 6.826862] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.14.0-rc1+ #126 [ 6.834252] Hardware name: Intel Corporation BRICKLAND/BRICKLAND, BIOS BRIVTIN1.86B.0047.R00.1402050741 02/05/2014 [ 6.845951] task: ffff880455a80000 ti: ffff880455a88000 task.ti: ffff880455a88000 [ 6.854437] RIP: 0010:[<ffffffff810e2dc8>] [<ffffffff810e2dc8>] __lock_acquire+0x11f8/0x1430 [ 6.864154] RSP: 0000:ffff880455a89ce0 EFLAGS: 00010046 [ 6.870179] RAX: 0000000000000046 RBX: 0000000000000002 RCX: 0000000000000000 [ 6.878249] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000000000c8 [ 6.886318] RBP: ffff880455a89d40 R08: 0000000000000002 R09: 0000000000000001 [ 6.894387] R10: 0000000000000000 R11: 0000000000000001 R12: ffff880455a80000 [ 6.902458] R13: 0000000000000000 R14: 00000000000000c8 R15: 0000000000000000 [ 6.910520] FS: 0000000000000000(0000) GS:ffff88045b800000(0000) knlGS:0000000000000000 [ 6.919687] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 6.926198] CR2: 00000000000000c8 CR3: 0000000001e0e000 CR4: 00000000001407f0 [ 6.934269] Stack: [ 6.936588] ffffffffffffff10 ffffffff810f59db 0000000000000010 0000000000000246 [ 6.945219] ffff880455a89d10 0000000000000000 ffffffff82bcb980 0000000000000046 [ 6.953850] 0000000000000000 0000000000000000 0000000000000002 0000000000000000 [ 6.962482] Call Trace: [ 6.965300] [<ffffffff810f59db>] ? vprintk_emit+0x4fb/0x5a0 [ 6.971716] [<ffffffff810e3185>] lock_acquire+0x185/0x200 [ 6.977941] [<ffffffff821fbbee>] ? init_dmars+0x839/0xa1d [ 6.984167] [<ffffffff81870b06>] _raw_spin_lock_irqsave+0x56/0x90 [ 6.991158] [<ffffffff821fbbee>] ? init_dmars+0x839/0xa1d [ 6.997380] [<ffffffff821fbbee>] init_dmars+0x839/0xa1d [ 7.003410] [<ffffffff8147d575>] ? pci_get_dev_by_id+0x75/0xd0 [ 7.010119] [<ffffffff821fc146>] intel_iommu_init+0x2f0/0x502 [ 7.016735] [<ffffffff821a7947>] ? iommu_setup+0x27d/0x27d [ 7.023056] [<ffffffff821a796f>] pci_iommu_init+0x28/0x52 [ 7.029282] [<ffffffff81002162>] do_one_initcall+0xf2/0x220 [ 7.035702] [<ffffffff810a4a29>] ? parse_args+0x2c9/0x450 [ 7.041919] [<ffffffff8219d1b1>] kernel_init_freeable+0x1c9/0x25b [ 7.048919] [<ffffffff8219c8d2>] ? do_early_param+0x8a/0x8a [ 7.055336] [<ffffffff8184d3f0>] ? rest_init+0x150/0x150 [ 7.061461] [<ffffffff8184d3fe>] kernel_init+0xe/0x100 [ 7.067393] [<ffffffff8187b5fc>] ret_from_fork+0x7c/0xb0 [ 7.073518] [<ffffffff8184d3f0>] ? rest_init+0x150/0x150 [ 7.079642] Code: 01 76 18 89 05 46 04 36 01 41 be 01 00 00 00 e9 2f 02 00 00 0f 1f 80 00 00 00 00 41 be 01 00 00 00 e9 1d 02 00 00 0f 1f 44 00 00 <49> 81 3e c0 31 34 82 b8 01 00 00 00 0f 44 d8 41 83 ff 01 0f 87 [ 7.104944] RIP [<ffffffff810e2dc8>] __lock_acquire+0x11f8/0x1430 [ 7.112008] RSP <ffff880455a89ce0> [ 7.115988] CR2: 00000000000000c8 [ 7.119784] ---[ end trace 13d756f0f462c538 ]--- [ 7.125034] note: swapper/0[1] exited with preempt_count 1 [ 7.131285] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009 [ 7.131285] Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com> Signed-off-by: Joerg Roedel <joro@8bytes.org>		2014-03-04 17:51:03 +01:00
..
amd_iommu_init.c	ACPI: Clean up inclusions of ACPI header files	2013-12-07 01:03:14 +01:00
amd_iommu_proto.h	perf/x86/amd: Add IOMMU Performance Counter resource management	2013-06-19 13:04:52 +02:00
amd_iommu_types.h	perf/x86/amd: Add IOMMU Performance Counter resource management	2013-06-19 13:04:52 +02:00
amd_iommu_v2.c	IOMMU Updates for Linux v3.6-rc1	2012-07-24 16:24:11 -07:00
amd_iommu.c	iommu/amd: Use dev_is_pci() to check whether it is pci device	2014-01-07 15:21:32 +01:00
arm-smmu.c	arm/smmu: Use irqsafe spinlock for domain lock	2014-02-20 13:04:47 +01:00
dmar.c	iommu/vt-d: Factor out dmar_alloc_dev_scope() for later reuse	2014-03-04 17:51:00 +01:00
exynos-iommu.c	iommu/exynos: Remove dead code (set_prefbuf)	2013-08-14 11:28:45 +02:00
fsl_pamu_domain.c	iommu/fsl_pamu: Use dev_is_pci() to check whether it is pci device	2014-01-07 15:23:08 +01:00
fsl_pamu_domain.h	iommu/fsl: Freescale PAMU driver and iommu implementation.	2013-08-14 11:38:34 +02:00
fsl_pamu.c	iommu/fsl: Remove unnecessary 'fsl-pamu' prefixes	2013-08-14 11:44:30 +02:00
fsl_pamu.h	iommu/fsl: Freescale PAMU driver and iommu implementation.	2013-08-14 11:38:34 +02:00
intel_irq_remapping.c	IOMMU Updates for Linux v3.14	2014-01-29 20:00:13 -08:00
intel-iommu.c	iommu/vt-d: Check for NULL pointer when freeing IOMMU data structure	2014-03-04 17:51:03 +01:00
iommu-traces.c	iommu: Add iommu_error class event to iommu trace	2013-09-25 11:07:04 +02:00
iommu.c	Merge branches 'iommu/fixes', 'tracing', 'core', 'arm/tegra', 'x86/vt-d', 'arm/smmu' and 'arm/shmobile' into next	2013-11-01 14:44:25 +01:00
iova.c	iommu: Fix typo in iommu	2012-07-24 12:58:49 +02:00
irq_remapping.c	iommu/vt-d, trivial: clean sparse warnings	2014-01-09 12:44:16 +01:00
irq_remapping.h	iommu/vt-d: add quirk for broken interrupt remapping on 55XX chipsets	2013-04-18 17:00:47 +02:00
Kconfig	iommu: shmobile: Enable driver compilation with COMPILE_TEST	2014-01-07 15:10:11 +01:00
Makefile	iommu: Add event tracing feature to iommu	2013-09-24 12:35:24 +02:00
msm_iommu_dev.c	drivers/iommu: remove unnecessary platform_set_drvdata()	2013-09-11 15:56:24 -07:00
msm_iommu_hw-8xxx.h	iommu/msm: Move mach includes to iommu directory	2013-08-06 11:18:03 -07:00
msm_iommu.c	iommu/msm: Move mach includes to iommu directory	2013-08-06 11:18:03 -07:00
msm_iommu.h	iommu/msm: Move mach includes to iommu directory	2013-08-06 11:18:03 -07:00
of_iommu.c	iommu: add missing include	2014-01-07 15:16:27 +01:00
omap-iommu2.c	iommu/omap: Adapt to runtime pm	2012-12-03 18:48:23 +01:00
omap-iommu-debug.c	drivers/iommu/omap-iommu-debug.c: fix decimal permissions	2014-02-25 15:25:42 -08:00
omap-iommu.c	drivers/iommu: remove unnecessary platform_set_drvdata()	2013-09-11 15:56:24 -07:00
omap-iommu.h	iommu/omap: Adapt to runtime pm	2012-12-03 18:48:23 +01:00
omap-iopgtable.h	drivers/iommu/omap-iopgtable.h: remove unneeded cast of void*	2013-11-13 12:09:00 +09:00
omap-iovmm.c	iommu/omap: fix checkpatch warnings in omap iommu code	2013-06-20 16:53:26 +02:00
pci.h	iommu: Move swap_pci_ref function to drivers/iommu/pci.h.	2013-04-23 14:55:00 +02:00
shmobile-iommu.c	iommu/shmobile: Allocate archdata with kzalloc()	2014-01-07 15:35:25 +01:00
shmobile-ipmmu.c	iommu/shmobile: Turn the flush_lock mutex into a spinlock	2014-01-07 15:35:25 +01:00
shmobile-ipmmu.h	iommu/shmobile: Turn the flush_lock mutex into a spinlock	2014-01-07 15:35:25 +01:00
tegra-gart.c	iommu/tegra-gart: Staticize tegra_gart_pm_ops	2013-11-01 14:23:20 +01:00
tegra-smmu.c	iommu/tegra-smmu: Staticize tegra_smmu_pm_ops	2013-11-01 14:23:33 +01:00