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| author | Hui Zhu <zhuhui@kylinos.cn> | 2026-05-29 09:41:30 +0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2026-06-08 18:21:31 -0700 |
| commit | c55dd3b46c1208d6d2ea737a8aefef4aa4c70cb8 (patch) | |
| tree | df7a449a31396d8fdef5084326f1ed76036323ef /include/linux/vmalloc.h | |
| parent | d3d58e9469008dc706863a7681fb9ae1856c8a4b (diff) | |
| download | lwn-c55dd3b46c1208d6d2ea737a8aefef4aa4c70cb8.tar.gz lwn-c55dd3b46c1208d6d2ea737a8aefef4aa4c70cb8.zip | |
vmalloc: fix NULL pointer dereference in is_vm_area_hugepages()
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>
Diffstat (limited to 'include/linux/vmalloc.h')
| -rw-r--r-- | include/linux/vmalloc.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h index 3b02c0c6b371..d87dc7f77f4e 100644 --- a/include/linux/vmalloc.h +++ b/include/linux/vmalloc.h @@ -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 |