In the Linux kernel, the following vulnerability has been resolved:
bpf, sockmap: Several fixes to bpf_msg_pop_data
Several fixes to bpf_msg_pop_data,
- In sk_msg_shift_left, we should put_page
- if (len == 0), return early is better
- pop the entire sk_msg (last == msg->sg.size) should be supported
- Fix for the value of variable "a"
- In sk_msg_shift_left, after shifting, i has already pointed to the next