Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Free special fields when update [lru_,]percpu_hash maps As [lru_,]percpu_hash maps support BPF_KPTR_{REF,PERCPU}, missing calls to 'bpf_obj_free_fields()' in 'pcpu_copy_value()' could cause the memory referenced by BPF_KPTR_{REF,PERCPU} fields to be held until the map gets freed. Fix this by calling 'bpf_obj_free_fields()' after 'copy_map_value[,_long]()' in 'pcpu_copy_value()'.

References 5

• git.kernel.org https://git.kernel.org/stable/c/3bf1378747e251571e0de15e7e0a6bf2919044e7
• git.kernel.org https://git.kernel.org/stable/c/4a03d69cece145e4fb527464be29c3806aa3221e
• git.kernel.org https://git.kernel.org/stable/c/6af6e49a76c9af7d42eb923703e7648cb2bf401a
• git.kernel.org https://git.kernel.org/stable/c/96a5cb7072cabbac5c66ac9318242c3bdceebb68
• git.kernel.org https://git.kernel.org/stable/c/994d6303ed0b84cbc795bb5becf7ed6de40d3f3c

Remediation