perf_events: Fix perf_counter_mmap() hook in mprotect()

As pointed out by Linus, commit dab5855 ("perf_counter: Add mmap event hooks to
mprotect()") is fundamentally wrong as mprotect_fixup() can free 'vma' due to
merging. Fix the problem by moving perf_event_mmap() hook to
mprotect_fixup().

Note: there's another successful return path from mprotect_fixup() if old
flags equal to new flags. We don't, however, need to call
perf_event_mmap() there because 'perf' already knows the VMA is
executable.

Reported-by: Dave Jones <[email protected]>
Analyzed-by: Linus Torvalds <[email protected]>
Cc: Ingo Molnar <[email protected]>
Reviewed-by: Peter Zijlstra <[email protected]>
Signed-off-by: Pekka Enberg <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions