Messages in this thread Patch in this message | | | From | Manjeet Pawar <> | Subject | [PATCH] mm/kfence: Null check is added for return value of addr_to_metadata | Date | Fri, 24 Sep 2021 17:44:02 +0530 |
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This patch add null check for return value of addr_to_metadata(). currently 'meta' is geting accessed without any NULL check but it is usually checked for this function.
Signed-off-by: Manjeet Pawar <manjeet.p@samsung.com> --- mm/kfence/core.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/mm/kfence/core.c b/mm/kfence/core.c index 575c685aa642..9b953cfa7fee 100644 --- a/mm/kfence/core.c +++ b/mm/kfence/core.c @@ -802,6 +802,9 @@ void __kfence_free(void *addr) { struct kfence_metadata *meta = addr_to_metadata((unsigned long)addr); + if (unlikely(!meta)) + return; + /* * If the objects of the cache are SLAB_TYPESAFE_BY_RCU, defer freeing * the object, as the object page may be recycled for other-typed -- 2.17.1
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