+ mm-move-debug-checks-from-__vunmap-to-remove_vm_area.patch added to mm-unstable branch

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

The patch titled
     Subject: mm: move debug checks from __vunmap to remove_vm_area
has been added to the -mm mm-unstable branch.  Its filename is
     mm-move-debug-checks-from-__vunmap-to-remove_vm_area.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-move-debug-checks-from-__vunmap-to-remove_vm_area.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Christoph Hellwig <hch@lst.de>
Subject: mm: move debug checks from __vunmap to remove_vm_area
Date: Sat, 21 Jan 2023 08:10:49 +0100

All these checks apply to the free_vm_area interface as well, so move them
to the common routine.

Link: https://lkml.kernel.org/r/20230121071051.1143058-9-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---


--- a/mm/vmalloc.c~mm-move-debug-checks-from-__vunmap-to-remove_vm_area
+++ a/mm/vmalloc.c
@@ -2588,11 +2588,20 @@ struct vm_struct *remove_vm_area(const v
 
 	might_sleep();
 
+	if (WARN(!PAGE_ALIGNED(addr), "Trying to vfree() bad address (%p)\n",
+			addr))
+		return NULL;
+
 	va = find_unlink_vmap_area((unsigned long)addr);
 	if (!va || !va->vm)
 		return NULL;
 	vm = va->vm;
+
+	debug_check_no_locks_freed(vm->addr, get_vm_area_size(vm));
+	debug_check_no_obj_freed(vm->addr, get_vm_area_size(vm));
 	kasan_free_module_shadow(vm);
+	kasan_poison_vmalloc(vm->addr, get_vm_area_size(vm));
+
 	free_unmap_vmap_area(va);
 	return vm;
 }
@@ -2664,10 +2673,6 @@ static void __vunmap(const void *addr, i
 	if (!addr)
 		return;
 
-	if (WARN(!PAGE_ALIGNED(addr), "Trying to vfree() bad address (%p)\n",
-			addr))
-		return;
-
 	area = remove_vm_area(addr);
 	if (unlikely(!area)) {
 		WARN(1, KERN_ERR "Trying to vfree() nonexistent vm area (%p)\n",
@@ -2675,11 +2680,6 @@ static void __vunmap(const void *addr, i
 		return;
 	}
 
-	debug_check_no_locks_freed(area->addr, get_vm_area_size(area));
-	debug_check_no_obj_freed(area->addr, get_vm_area_size(area));
-
-	kasan_poison_vmalloc(area->addr, get_vm_area_size(area));
-
 	vm_remove_mappings(area, deallocate_pages);
 
 	if (deallocate_pages) {
_

Patches currently in -mm which might be from hch@lst.de are

revert-remoteproc-qcom_q6v5_mss-map-unmap-metadata-region-before-after-use.patch
mm-reject-vmap-with-vm_flush_reset_perms.patch
mm-remove-__vfree.patch
mm-remove-__vfree_deferred.patch
mm-move-vmalloc_init-and-free_work-down-in-vmallocc.patch
mm-call-vfree-instead-of-__vunmap-from-delayed_vfree_work.patch
mm-move-__remove_vm_area-out-of-va_remove_mappings.patch
mm-use-remove_vm_area-in-__vunmap.patch
mm-move-debug-checks-from-__vunmap-to-remove_vm_area.patch
mm-split-__vunmap.patch
mm-refactor-va_remove_mappings.patch