CVE-2022-49801

In the Linux kernel, the following vulnerability has been resolved: tracing: Fix memory leak in tracing_read_pipe() kmemleak reports this issue: unreferenced object 0xffff888105a18900 (size 128): comm "test_progs", pid 18933, jiffies 4336275356 (age 22801.766s) hex dump (first 32 bytes): 25 73 00 90 81 88 ff ff 26 05 00 00 42 01 58 04 %s......&...B.X. 03 00 00 00 02 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [ ] __kmalloc_node_track_caller+0x4a/0x140 [ ] krealloc+0x8d/0xf0 [ ] trace_iter_expand_format+0x99/0x150 [ ] trace_check_vprintf+0x1e0/0x11d0 [ ] trace_event_printf+0xb6/0xf0 [ ] trace_raw_output_bpf_trace_printk+0x89/0xc0 [ ] print_trace_line+0x73c/0x1480 [ ] tracing_read_pipe+0x45c/0x9f0 [ ] vfs_read+0x17b/0x7c0 [ ] ksys_read+0xed/0x1c0 [ ] do_syscall_64+0x3b/0x90 [ ] entry_SYSCALL_64_after_hwframe+0x63/0xcd iter->fmt alloced in tracing_read_pipe() -> .. ->trace_iter_expand_format(), but not freed, to fix, add free in tracing_release_pipe()