The quilt patch titled Subject: mm/mempolicy: fix set_mempolicy_home_node() previous VMA pointer has been removed from the -mm tree. Its filename was mm-mempolicy-fix-set_mempolicy_home_node-previous-vma-pointer.patch
This patch was dropped because it was merged into the mm-hotfixes-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------ From: "Liam R. Howlett" Liam.Howlett@oracle.com Subject: mm/mempolicy: fix set_mempolicy_home_node() previous VMA pointer Date: Thu, 28 Sep 2023 13:24:32 -0400
The two users of mbind_range() are expecting that mbind_range() will update the pointer to the previous VMA, or return an error. However, set_mempolicy_home_node() does not call mbind_range() if there is no VMA policy. The fix is to update the pointer to the previous VMA prior to continuing iterating the VMAs when there is no policy.
Users may experience a WARN_ON() during VMA policy updates when updating a range of VMAs on the home node.
Link: https://lkml.kernel.org/r/20230928172432.2246534-1-Liam.Howlett@oracle.com Link: https://lore.kernel.org/linux-mm/CALcu4rbT+fMVNaO_F2izaCT+e7jzcAciFkOvk21HGJ... Fixes: f4e9e0e69468 ("mm/mempolicy: fix use-after-free of VMA iterator") Signed-off-by: Liam R. Howlett Liam.Howlett@oracle.com Reported-by: Yikebaer Aizezi yikebaer61@gmail.com Closes: https://lore.kernel.org/linux-mm/CALcu4rbT+fMVNaO_F2izaCT+e7jzcAciFkOvk21HGJ... Reviewed-by: Lorenzo Stoakes lstoakes@gmail.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---
mm/mempolicy.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/mm/mempolicy.c~mm-mempolicy-fix-set_mempolicy_home_node-previous-vma-pointer +++ a/mm/mempolicy.c @@ -1543,8 +1543,10 @@ SYSCALL_DEFINE4(set_mempolicy_home_node, * the home node for vmas we already updated before. */ old = vma_policy(vma); - if (!old) + if (!old) { + prev = vma; continue; + } if (old->mode != MPOL_BIND && old->mode != MPOL_PREFERRED_MANY) { err = -EOPNOTSUPP; break; _
Patches currently in -mm which might be from Liam.Howlett@oracle.com are
mmap-add-clarifying-comment-to-vma_merge-code.patch radix-tree-test-suite-fix-allocation-calculation-in-kmem_cache_alloc_bulk.patch