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authorWang Yufen <wangyufen@huawei.com>2022-11-07 19:04:50 +0800
committerSteven Rostedt (Google) <rostedt@goodmis.org>2022-11-16 20:29:00 -0500
commit649e72070cbbb8600eb823833e4748f5a0815116 (patch)
treedabbc9cdfdd000288d568caa0155fc3cc1ca9189
parent31029a8b2c7e656a0289194ef16415050ae4c4ac (diff)
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() Link: https://lkml.kernel.org/r/1667819090-4643-1-git-send-email-wangyufen@huawei.com Cc: stable@vger.kernel.org Fixes: efbbdaa22bb7 ("tracing: Show real address for trace event arguments") Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Signed-off-by: Wang Yufen <wangyufen@huawei.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
-rw-r--r--kernel/trace/trace.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index c6c7a0af3ed2..5bd202d6d79a 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -6657,6 +6657,7 @@ static int tracing_release_pipe(struct inode *inode, struct file *file)
mutex_unlock(&trace_types_lock);
free_cpumask_var(iter->started);
+ kfree(iter->fmt);
mutex_destroy(&iter->mutex);
kfree(iter);