https://github.com/torvalds/linux
Revision d2cf909cda5f8c5609cb7ed6cda816c3e15528c7 authored by Frederic Barrat on 17 June 2016, 16:53:28 UTC, committed by Michael Ellerman on 19 October 2016, 09:32:49 UTC
If a cxl adapter faults on an invalid address for a kernel context, we
may enter copro_calculate_slb() with a NULL mm pointer (kernel
context) and an effective address which looks like a user
address. Which will cause a crash when dereferencing mm. It is clearly
an AFU bug, but there's no reason to crash either. So return an error,
so that cxl can ack the interrupt with an address error.

Fixes: 73d16a6e0e51 ("powerpc/cell: Move data segment faulting code out of cell platform")
Cc: stable@vger.kernel.org # v3.18+
Signed-off-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Acked-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
1 parent 1001354
History
Tip revision: d2cf909cda5f8c5609cb7ed6cda816c3e15528c7 authored by Frederic Barrat on 17 June 2016, 16:53:28 UTC
powerpc/mm: Prevent unlikely crash in copro_calculate_slb()
Tip revision: d2cf909
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.cocciconfig -rw-r--r-- 59 bytes
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