https://github.com/torvalds/linux
Revision b460b512417ae9c8b51a3bdcc09020cd6c60ff69 authored by Alexey Kardashevskiy on 02 June 2020, 02:56:12 UTC, committed by Michael Ellerman on 27 August 2020, 07:41:44 UTC
The bhrb_filter_map ("The Branch History Rolling Buffer") callback is
only defined in raw CPUs' power_pmu structs. The "architected" CPUs
use generic_compat_pmu, which does not have this callback, and crashes
occur if a user tries to enable branch stack for an event.
This add a NULL pointer check for bhrb_filter_map() which behaves as
if the callback returned an error.
This does not add the same check for config_bhrb() as the only caller
checks for cpuhw->bhrb_users which remains zero if bhrb_filter_map==0.
Fixes: be80e758d0c2 ("powerpc/perf: Add generic compat mode pmu driver")
Cc: stable@vger.kernel.org # v5.2+
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200602025612.62707-1-aik@ozlabs.ru
1 parent b91eb51
Tip revision: b460b512417ae9c8b51a3bdcc09020cd6c60ff69 authored by Alexey Kardashevskiy on 02 June 2020, 02:56:12 UTC
powerpc/perf: Fix crashes with generic_compat_pmu & BHRB
powerpc/perf: Fix crashes with generic_compat_pmu & BHRB
Tip revision: b460b51
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| .clang-format | -rw-r--r-- | 15.8 KB |
| .cocciconfig | -rw-r--r-- | 59 bytes |
| .get_maintainer.ignore | -rw-r--r-- | 71 bytes |
| .gitattributes | -rw-r--r-- | 62 bytes |
| .gitignore | -rw-r--r-- | 1.8 KB |
| .mailmap | -rw-r--r-- | 16.7 KB |
| COPYING | -rw-r--r-- | 496 bytes |
| CREDITS | -rw-r--r-- | 97.4 KB |
| Kbuild | -rw-r--r-- | 1.3 KB |
| Kconfig | -rw-r--r-- | 555 bytes |
| MAINTAINERS | -rw-r--r-- | 555.8 KB |
| Makefile | -rw-r--r-- | 61.8 KB |
| README | -rw-r--r-- | 727 bytes |
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