TLDRVuln - Cybersecurity Vulnerabilities Made Simple

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:

[<00000000560143a1>] __kmalloc_node_track_caller+0x4a/0x140

[<000000006af00822>] krealloc+0x8d/0xf0

[<00000000c309be6a>] trace_iter_expand_format+0x99/0x150

[<000000005a53bdb6>] trace_check_vprintf+0x1e0/0x11d0

[<0000000065629d9d>] trace_event_printf+0xb6/0xf0

[<000000009a690dc7>] trace_raw_output_bpf_trace_printk+0x89/0xc0

[<00000000d22db172>] print_trace_line+0x73c/0x1480

[<00000000cdba76ba>] tracing_read_pipe+0x45c/0x9f0

[<0000000015b58459>] vfs_read+0x17b/0x7c0

[<000000004aeee8ed>] ksys_read+0xed/0x1c0

[<0000000063d3d898>] do_syscall_64+0x3b/0x90

[<00000000a06dda7f>] 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()