[merged mm-stable] vmalloc-fix-null-pointer-dereference-in-is_vm_area_hugepages.patch removed from -mm tree

[Andrew Morton <akpm@linux-foundation.org>]

The quilt patch titled
     Subject: vmalloc: fix NULL pointer dereference in is_vm_area_hugepages()
has been removed from the -mm tree.  Its filename was
     vmalloc-fix-null-pointer-dereference-in-is_vm_area_hugepages.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Hui Zhu <zhuhui@kylinos.cn>
Subject: vmalloc: fix NULL pointer dereference in is_vm_area_hugepages()
Date: Fri, 29 May 2026 09:41:30 +0800

find_vm_area() can return NULL if the given address is not a valid vmalloc
area.  Check the return value before dereferencing it to avoid a kernel
crash.

Link: https://lore.kernel.org/20260529014130.671291-1-hui.zhu@linux.dev
Fixes: 121e6f3258fe ("mm/vmalloc: hugepage vmalloc mappings")
Signed-off-by: Hui Zhu <zhuhui@kylinos.cn>
Reviewed-by: Dev Jain <dev.jain@arm.com>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/vmalloc.h |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/include/linux/vmalloc.h~vmalloc-fix-null-pointer-dereference-in-is_vm_area_hugepages
+++ a/include/linux/vmalloc.h
@@ -265,7 +265,9 @@ static inline bool is_vm_area_hugepages(
 	 * allocated in the vmalloc layer.
 	 */
 #ifdef CONFIG_HAVE_ARCH_HUGE_VMALLOC
-	return find_vm_area(addr)->page_order > 0;
+	struct vm_struct *area = find_vm_area(addr);
+
+	return area && area->page_order > 0;
 #else
 	return false;
 #endif
_

Patches currently in -mm which might be from zhuhui@kylinos.cn are