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Change History

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

bpf: fix a memory leak in the LRU and LRU_PERCPU hash maps

The LRU and LRU_PERCPU maps allocate a new element on update before locking the
target hash table bucket. Right after that the maps try to lock the bucket.
If this fails, then maps return -EBUSY to the caller without releasing the
allocated element. This makes the element untracked: it doesn't belong to
either of free lists, and it doesn't belong to the hash table, so can't be
re-used; this eventually leads to the permanent -ENOMEM on LRU map updates,
which is unexpected. Fix this by returning the element to the local free list
if bucket locking fails.

https://git.kernel.org/stable/c/1a9e80f757bbb1562d82e350afce2bb2f712cc3d

https://git.kernel.org/stable/c/79ea1a12fb9a8275b6e19d4ca625dd872dedcbb9

https://git.kernel.org/stable/c/965e9cccbe6b9c7b379908cebcb5e3a47f20dd5e

https://git.kernel.org/stable/c/b34ffb0c6d23583830f9327864b9c1f486003305