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vmalloc: fix NULL pointer dereference in is_vm_area_hugepages()

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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: 121e6f3258 ("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>
This commit is contained in:
Hui Zhu 2026-05-29 09:41:30 +08:00 committed by Andrew Morton
parent d3d58e9469
commit c55dd3b46c
1 changed files with 3 additions and 1 deletions
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4
include/linux/vmalloc.h
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@ -265,7 +265,9 @@ static inline bool is_vm_area_hugepages(const void *addr)
* 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