diff options
| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2018-11-07 16:18:50 +0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2018-11-08 12:26:35 +0300 |
| commit | e5b78f2e349eef5d4fca5dc1cf5a3b4b2cc27abd (patch) | |
| tree | 9cc66e69b755008e58924e0eb81a14297b59cf27 /drivers/iommu | |
| parent | 19ed3e2dd8549c1a34914e8dad01b64e7837645a (diff) | |
| download | linux-e5b78f2e349eef5d4fca5dc1cf5a3b4b2cc27abd.tar.xz | |
iommu/ipmmu-vmsa: Fix crash on early domain free
If iommu_ops.add_device() fails, iommu_ops.domain_free() is still
called, leading to a crash, as the domain was only partially
initialized:
ipmmu-vmsa e67b0000.mmu: Cannot accommodate DMA translation for IOMMU page tables
sata_rcar ee300000.sata: Unable to initialize IPMMU context
iommu: Failed to add device ee300000.sata to group 0: -22
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000038
...
Call trace:
ipmmu_domain_free+0x1c/0xa0
iommu_group_release+0x48/0x68
kobject_put+0x74/0xe8
kobject_del.part.0+0x3c/0x50
kobject_put+0x60/0xe8
iommu_group_get_for_dev+0xa8/0x1f0
ipmmu_add_device+0x1c/0x40
of_iommu_configure+0x118/0x190
Fix this by checking if the domain's context already exists, before
trying to destroy it.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Fixes: d25a2a16f0889 ('iommu: Add driver for Renesas VMSA-compatible IPMMU')
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/ipmmu-vmsa.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c index b98a03189580..ddf3a492e1d5 100644 --- a/drivers/iommu/ipmmu-vmsa.c +++ b/drivers/iommu/ipmmu-vmsa.c @@ -498,6 +498,9 @@ static int ipmmu_domain_init_context(struct ipmmu_vmsa_domain *domain) static void ipmmu_domain_destroy_context(struct ipmmu_vmsa_domain *domain) { + if (!domain->mmu) + return; + /* * Disable the context. Flush the TLB as required when modifying the * context registers. |