Commit 85beb1c4 authored by Michael Ellerman's avatar Michael Ellerman

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: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 941711a3
...@@ -682,6 +682,9 @@ static inline unsigned long get_kernel_vsid(unsigned long ea, int ssize) ...@@ -682,6 +682,9 @@ static inline unsigned long get_kernel_vsid(unsigned long ea, int ssize)
{ {
unsigned long context; 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 * For kernel space, we use context ids 1-4 to map the address space as
* below: * below:
......
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