The patch titled Subject: hugetlb_cgroup: fix illegal access to memory has been removed from the -mm tree. Its filename was hugetlb_cgroup-fix-illegal-access-to-memory.patch This patch was dropped because it was merged into mainline or a subsystem tree ------------------------------------------------------ From: Mina Almasry <almasrymina@xxxxxxxxxx> Subject: hugetlb_cgroup: fix illegal access to memory This appears to be a mistake in commit faced7e0806cf ("mm: hugetlb controller for cgroups v2"). Essentially that commit does a hugetlb_cgroup_from_counter assuming that page_counter_try_charge has initialized counter, but if page_counter_try_charge has failed then it seems it does not initialize counter, so hugetlb_cgroup_from_counter(counter) ends up pointing to random memory, causing kasan to complain. Solution, simply use h_cg, instead of hugetlb_cgroup_from_counter(counter), since that is a reference to the hugetlb_cgroup anyway. After this change kasan ceases to complain. Link: http://lkml.kernel.org/r/20200313223920.124230-1-almasrymina@xxxxxxxxxx Fixes: faced7e0806cf ("mm: hugetlb controller for cgroups v2") Signed-off-by: Mina Almasry <almasrymina@xxxxxxxxxx> Reported-by: syzbot+cac0c4e204952cf449b1@xxxxxxxxxxxxxxxxxxxxxxxxx Acked-by: Giuseppe Scrivano <gscrivan@xxxxxxxxxx> Acked-by: Tejun Heo <tj@xxxxxxxxxx> Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx> Cc: David Rientjes <rientjes@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/hugetlb_cgroup.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/mm/hugetlb_cgroup.c~hugetlb_cgroup-fix-illegal-access-to-memory +++ a/mm/hugetlb_cgroup.c @@ -240,8 +240,7 @@ again: if (!page_counter_try_charge(&h_cg->hugepage[idx], nr_pages, &counter)) { ret = -ENOMEM; - hugetlb_event(hugetlb_cgroup_from_counter(counter, idx), idx, - HUGETLB_MAX); + hugetlb_event(h_cg, idx, HUGETLB_MAX); } css_put(&h_cg->css); done: _ Patches currently in -mm which might be from almasrymina@xxxxxxxxxx are hugetlb_cgroup-add-hugetlb_cgroup-reservation-counter.patch hugetlb_cgroup-add-interface-for-charge-uncharge-hugetlb-reservations.patch mm-hugetlb_cgroup-fix-hugetlb_cgroup-migration.patch hugetlb_cgroup-add-reservation-accounting-for-private-mappings.patch hugetlb-disable-region_add-file_region-coalescing.patch hugetlb-disable-region_add-file_region-coalescing-fix.patch hugetlb_cgroup-add-accounting-for-shared-mappings.patch hugetlb_cgroup-support-noreserve-mappings.patch hugetlb-support-file_region-coalescing-again.patch hugetlb-support-file_region-coalescing-again-fix.patch hugetlb-support-file_region-coalescing-again-fix-2.patch hugetlb_cgroup-add-hugetlb_cgroup-reservation-tests.patch hugetlb_cgroup-add-hugetlb_cgroup-reservation-docs.patch