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iommu/amd: Take into account that alloc_dev_data() may return NULL 

find_dev_data() does not check whether the return value alloc_dev_data()
is NULL. This was okay once because the pointer was returned once as-is.
Since commit df3f7a6e8e ("iommu/amd: Use is_attach_deferred
call-back") the pointer may be used within find_dev_data() so a NULL
check is required.

Cc: Baoquan He <bhe@redhat.com>
Fixes: df3f7a6e8e ("iommu/amd: Use is_attach_deferred call-back")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Sebastian Andrzej Siewior 2018-03-22 16:22:33 +01:00 committed by Joerg Roedel
parent 90ca3859f5
commit 39ffe39545
1 changed files with 2 additions and 0 deletions
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2
drivers/iommu/amd_iommu.c
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@ -310,6 +310,8 @@ static struct iommu_dev_data *find_dev_data(u16 devid)
if (dev_data == NULL) {
dev_data = alloc_dev_data(devid);
if (!dev_data)
return NULL;
if (translation_pre_enabled(iommu))
dev_data->defer_attach = true;