Description
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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
20b6cc34ea74b6a84599c1f8a70f3315b56a1883 to < 79ea1a12fb9a8275b6e19d4ca625dd872dedcbb9affected20b6cc34ea74b6a84599c1f8a70f3315b56a1883 to < 1a9e80f757bbb1562d82e350afce2bb2f712cc3daffected20b6cc34ea74b6a84599c1f8a70f3315b56a1883 to < 965e9cccbe6b9c7b379908cebcb5e3a47f20dd5eaffected20b6cc34ea74b6a84599c1f8a70f3315b56a1883 to < b34ffb0c6d23583830f9327864b9c1f486003305affected
Linux Linux
Default version status: affected
5.11affected0 to < 5.11unaffected5.15.115 to ≤ 5.15.*unaffected6.1.31 to ≤ 6.1.*unaffected6.3.5 to ≤ 6.3.*unaffected6.4 to ≤ *unaffected