diff options
| author | Aaron Ma <aaron.ma@canonical.com> | 2019-03-13 16:53:24 +0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2019-03-15 18:22:05 +0300 |
| commit | bb6bccba390c7d743c1e4427de4ef284c8cc6869 (patch) | |
| tree | 6ecc7bc4382425f2d9a4b0188848b9454261cbf9 /drivers/iommu | |
| parent | d05e4c8600c36084ce9de6249bb972c9bdd75b7e (diff) | |
| download | linux-bb6bccba390c7d743c1e4427de4ef284c8cc6869.tar.xz | |
iommu/amd: Fix NULL dereference bug in match_hid_uid
Add a non-NULL check to fix potential NULL pointer dereference
Cleanup code to call function once.
Signed-off-by: Aaron Ma <aaron.ma@canonical.com>
Fixes: 2bf9a0a12749b ('iommu/amd: Add iommu support for ACPI HID devices')
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/amd_iommu.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index 6b0760dafb3e..b319e51c379b 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -140,10 +140,14 @@ static struct lock_class_key reserved_rbtree_key; static inline int match_hid_uid(struct device *dev, struct acpihid_map_entry *entry) { + struct acpi_device *adev = ACPI_COMPANION(dev); const char *hid, *uid; - hid = acpi_device_hid(ACPI_COMPANION(dev)); - uid = acpi_device_uid(ACPI_COMPANION(dev)); + if (!adev) + return -ENODEV; + + hid = acpi_device_hid(adev); + uid = acpi_device_uid(adev); if (!hid || !(*hid)) return -ENODEV; |