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| author | Michael Ellerman <mpe@ellerman.id.au> | 2017-03-29 14:10:34 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-03-31 14:09:59 +0200 |
| commit | 85beb1c486df76a7a851a0e063785282c2608f37 (patch) | |
| tree | da13f327c397a15d75ec0790bc143d9c790b4f23 /arch/powerpc | |
| parent | powerpc/mm/hash: Use context ids 1-4 for the kernel (diff) | |
| download | linux-85beb1c486df76a7a851a0e063785282c2608f37.tar.xz linux-85beb1c486df76a7a851a0e063785282c2608f37.zip | |
powerpc/mm/hash: Check for non-kernel address in get_kernel_vsid()
get_kernel_vsid() has a very stern comment saying that it's only valid
for kernel addresses, but there's nothing in the code to enforce that.
Rather than hoping our callers are well behaved, add a check and return
a VSID of 0 (invalid).
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/include/asm/book3s/64/mmu-hash.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/book3s/64/mmu-hash.h b/arch/powerpc/include/asm/book3s/64/mmu-hash.h index a5ab6f5b8a7f..10a34282829e 100644 --- a/arch/powerpc/include/asm/book3s/64/mmu-hash.h +++ b/arch/powerpc/include/asm/book3s/64/mmu-hash.h @@ -682,6 +682,9 @@ static inline unsigned long get_kernel_vsid(unsigned long ea, int ssize) { unsigned long context; + if (!is_kernel_addr(ea)) + return 0; + /* * For kernel space, we use context ids 1-4 to map the address space as * below: |