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Message-Id: <1523961828-9485-3-git-send-email-cpandya@codeaurora.org>
Date: Tue, 17 Apr 2018 16:13:48 +0530
From: Chintan Pandya <cpandya@...eaurora.org>
To: vbabka@...e.cz, labbott@...hat.com, catalin.marinas@....com,
hannes@...xchg.org, f.fainelli@...il.com, xieyisheng1@...wei.com,
ard.biesheuvel@...aro.org, richard.weiyang@...il.com,
byungchul.park@....com
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
khandual@...ux.vnet.ibm.com, mhocko@...nel.org,
Chintan Pandya <cpandya@...eaurora.org>
Subject: [PATCH v2 2/2] mm: vmalloc: Pass proper vm_start into debugobjects
Client can call vunmap with some intermediate 'addr'
which may not be the start of the VM area. Entire
unmap code works with vm->vm_start which is proper
but debug object API is called with 'addr'. This
could be a problem within debug objects.
Pass proper start address into debug object API.
Signed-off-by: Chintan Pandya <cpandya@...eaurora.org>
---
mm/vmalloc.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 12d675c..033c918 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1124,15 +1124,15 @@ void vm_unmap_ram(const void *mem, unsigned int count)
BUG_ON(addr > VMALLOC_END);
BUG_ON(!PAGE_ALIGNED(addr));
- debug_check_no_locks_freed(mem, size);
-
if (likely(count <= VMAP_MAX_ALLOC)) {
+ debug_check_no_locks_freed(mem, size);
vb_free(mem, size);
return;
}
va = find_vmap_area(addr);
BUG_ON(!va);
+ debug_check_no_locks_freed(va->va_start, (va->va_end - va->va_start));
free_unmap_vmap_area(va);
}
EXPORT_SYMBOL(vm_unmap_ram);
@@ -1507,8 +1507,8 @@ static void __vunmap(const void *addr, int deallocate_pages)
return;
}
- debug_check_no_locks_freed(addr, get_vm_area_size(area));
- debug_check_no_obj_freed(addr, get_vm_area_size(area));
+ debug_check_no_locks_freed(area->addr, get_vm_area_size(area));
+ debug_check_no_obj_freed(area->addr, get_vm_area_size(area));
remove_vm_area(addr);
if (deallocate_pages) {
--
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