Vulnerability CVE-2021-47516
Published: 2024-05-24

Description:
In the Linux kernel, the following vulnerability has been resolved:

nfp: Fix memory leak in nfp_cpp_area_cache_add()

In line 800 (#1), nfp_cpp_area_alloc() allocates and initializes a
CPP area structure. But in line 807 (#2), when the cache is allocated
failed, this CPP area structure is not freed, which will result in
memory leak.

We can fix it by freeing the CPP area when the cache is allocated
failed (#2).

792 int nfp_cpp_area_cache_add(struct nfp_cpp *cpp, size_t size)
793 {
794 struct nfp_cpp_area_cache *cache;
795 struct nfp_cpp_area *area;

800 area = nfp_cpp_area_alloc(cpp, NFP_CPP_ID(7, NFP_CPP_ACTION_RW, 0),
801 0, size);
// #1: allocates and initializes

802 if (!area)
803 return -ENOMEM;

805 cache = kzalloc(sizeof(*cache), GFP_KERNEL);
806 if (!cache)
807 return -ENOMEM; // #2: missing free

817 return 0;
818 }

 References:
https://git.kernel.org/stable/c/3e93abcdcec0436fbf0b6a88ae806902426895a2
https://git.kernel.org/stable/c/eb51f639ef3fd5498b7def290ed8681b6aadd9a7
https://git.kernel.org/stable/c/2e0e072e62fdaf7816220af08e05c020f0fcb77a
https://git.kernel.org/stable/c/484069b5de9d223cc1c64c6f80389a99cfef51f1
https://git.kernel.org/stable/c/f707820c09239d6f67699d9b2ff57863cc7905b0
https://git.kernel.org/stable/c/c56c96303e9289cc34716b1179597b6f470833de
Copyright 2026, cxsecurity.com

 

Back to Top