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x86/sgx: use vma_lookup() in sgx_encl_find() 

commit 9ce2c3fc0b upstream.

Use vma_lookup() to find the VMA at a specific address.  As vma_lookup()
will return NULL if the address is not within any VMA, the start address
no longer needs to be validated.

Intel-SIG: commit 9ce2c3fc0b x86/sgx: use vma_lookup() in
sgx_encl_find().
Backport for SGX virtualization support.

Link: https://lkml.kernel.org/r/20210521174745.2219620-10-Liam.Howlett@Oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Reviewed-by: Laurent Dufour <ldufour@linux.ibm.com>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Fan Du <fan.du@intel.com>
[ Zhiquan Li: amend commit log ]
Signed-off-by: Zhiquan Li <zhiquan1.li@intel.com>
This commit is contained in:
Liam Howlett 2021-06-28 19:39:14 -07:00 committed by Jianping Liu
parent 0aa1db9b22
commit 024277f378
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kernel/cpu/sgx/encl.h
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@ -91,8 +91,8 @@ static inline int sgx_encl_find(struct mm_struct *mm, unsigned long addr,
{
struct vm_area_struct *result;
result = find_vma(mm, addr);
if (!result || result->vm_ops != &sgx_vm_ops || addr < result->vm_start)
result = vma_lookup(mm, addr);
if (!result || result->vm_ops != &sgx_vm_ops)
return -EINVAL;
*vma = result;