After kill_procs(), tk will be freed without being removed from the to_kill
list. In the next iteration, the freed list entry in the to_kill list will
be accessed, thus leading to use-after-free issue. Fix it by reinitializing
the to_kill list after unmap_and_kill().
Fixes: c36e20249571 ("mm: introduce mf_dax_kill_procs() for fsdax case")
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
---
mm/memory-failure.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 7023c3d81273..a2f4e8b00a26 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1658,6 +1658,8 @@ int mf_dax_kill_procs(struct address_space *mapping, pgoff_t index,
collect_procs_fsdax(page, mapping, index, &to_kill);
unmap_and_kill(&to_kill, page_to_pfn(page), mapping,
index, mf_flags);
+ /* Reinitialize to_kill list for later resuing. */
+ INIT_LIST_HEAD(&to_kill);
unlock:
dax_unlock_mapping_entry(mapping, index, cookie);
}
--
2.23.0
