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| author | Waiman Long <longman@redhat.com> | 2024-06-26 03:16:39 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-07-04 08:40:36 +0300 |
| commit | 82f0b6f041fad768c28b4ad05a683065412c226e (patch) | |
| tree | 7f007bc0ea6844f3ca068f8321d4fd83628dbfa5 /tools/perf/scripts/python/export-to-sqlite.py | |
| parent | fa2690af573dfefb47ba6eef888797a64b6b5f3c (diff) | |
| download | linux-82f0b6f041fad768c28b4ad05a683065412c226e.tar.xz | |
mm: prevent derefencing NULL ptr in pfn_section_valid()
Commit 5ec8e8ea8b77 ("mm/sparsemem: fix race in accessing
memory_section->usage") changed pfn_section_valid() to add a READ_ONCE()
call around "ms->usage" to fix a race with section_deactivate() where
ms->usage can be cleared. The READ_ONCE() call, by itself, is not enough
to prevent NULL pointer dereference. We need to check its value before
dereferencing it.
Link: https://lkml.kernel.org/r/20240626001639.1350646-1-longman@redhat.com
Fixes: 5ec8e8ea8b77 ("mm/sparsemem: fix race in accessing memory_section->usage")
Signed-off-by: Waiman Long <longman@redhat.com>
Cc: Charan Teja Kalla <quic_charante@quicinc.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'tools/perf/scripts/python/export-to-sqlite.py')
0 files changed, 0 insertions, 0 deletions