[PATCH] mm: swap_cgroup: fix NULL deref in lookup_swap_cgroup_id on swapless host

From: "Jose Fernandez (Anthropic)" <[email protected]>

[ Upstream commit 63b02a9409cb5180398491b093e48bcb5315f5fb ]

lookup_swap_cgroup_id() passes swap_cgroup_ctrl[type].map to
__swap_cgroup_id_lookup() without checking that the type was ever
registered via swap_cgroup_swapon().  On a swapless host every ctrl->map
is NULL, so __swap_cgroup_id_lookup() dereferences NULL + a scaled
swp_offset().

Since commit bea67dcc5eea ("mm: attempt to batch free swap entries for
zap_pte_range()"), zap_pte_range() -> swap_pte_batch() calls
lookup_swap_cgroup_id() on any non-present, non-none PTE that decodes as a
real swap entry, without first validating it against swap_info[].  A
single PTE corrupted into a type-0 swap entry takes the host down at
process exit.

We hit this in production on a swapless 6.12.58 host: ~1s of
"get_swap_device: Bad swap file entry 3f800204222bb" (do_swap_page() being
correctly defensive about the same entry) followed by

  BUG: unable to handle page fault for address: 000003f800204220
  RIP: 0010:lookup_swap_cgroup_id+0x2b/0x60
  Call Trace:
   swap_pte_batch+0xbf/0x230
   zap_pte_range+0x4c8/0x780
   unmap_page_range+0x190/0x3e0
   exit_mmap+0xd9/0x3c0
   do_exit+0x20c/0x4b0

syzbot has reported the identical stack.

The source of the PTE corruption is a separate bug; this change makes the
teardown path as robust as the fault path already is.  Every other caller
of lookup_swap_cgroup_id() is downstream of a get_swap_device() that has
already validated the entry, so the new branch is cold.

Link: https://lore.kernel.org/20260504-swap-cgroup-fix-7-0-v1-1-f53ff41ee553-fxUVXftIFDnyG1zEObXtfA@public.gmane.org
Fixes: bea67dcc5eea ("mm: attempt to batch free swap entries for zap_pte_range()")
Signed-off-by: Jose Fernandez (Anthropic) <[email protected]>
Reported-by: syzbot+e12bd9ca48157add237a-Pl5Pbv+GP7P466ipTTIvnc23WoclnBCfAL8bYrjMMd8@public.gmane.org
Link: https://lore.kernel.org/r/69859728.050a0220.3b3015.0033.GAE-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org
Assisted-by: Claude:unspecified
Cc: Barry Song <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Kairui Song <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Muchun Song <[email protected]>
Cc: Roman Gushchin <[email protected]>
Cc: Shakeel Butt <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <akpm-de/[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: chenxin <[email protected]>
---
 mm/swap_cgroup.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mm/swap_cgroup.c b/mm/swap_cgroup.c
index db6c4a26cf59..2d0425f4a6b9 100644
--- a/mm/swap_cgroup.c
+++ b/mm/swap_cgroup.c
@@ -161,6 +161,11 @@ unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id,
  */
 unsigned short lookup_swap_cgroup_id(swp_entry_t ent)
 {
+	struct swap_cgroup_ctrl *ctrl;
+
+	ctrl = &swap_cgroup_ctrl[swp_type(ent)];
+	if (unlikely(!ctrl->map))
+		return 0;
 	return lookup_swap_cgroup(ent, NULL)->id;
 }
 
-- 
2.50.1