In the Linux kernel, the following vulnerability has been resolved:
nfp: Fix memory leak in nfpcppareacacheadd()
In line 800 (#1), nfpcpparea_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 nfpcppareacacheadd(struct nfpcpp *cpp, sizet size) 793 { 794 struct nfpcppareacache *cache; 795 struct nfpcpp_area *area;
800 area = nfpcppareaalloc(cpp, NFPCPPID(7, NFPCPPACTIONRW, 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 }