From: Luis Henriques <lhenriques@suse.com>
To: Steven Rostedt <rostedt@goodmis.org>, Ingo Molnar <mingo@redhat.com>
Cc: linux-kernel@vger.kernel.org, Luis Henriques <lhenriques@suse.com>
Subject: [PATCH] ftrace: fix memory leak in ftrace_graph_release()
Date: Thu, 25 May 2017 16:20:38 +0100
Message-ID: <20170525152038.7661-1-lhenriques@suse.com> (raw)
ftrace_hash is being kfree'ed in ftrace_graph_release(), however the
->buckets field is not. This results in a memory leak that is easily
captured by kmemleak:
unreferenced object 0xffff880038afe000 (size 8192):
comm "trace-cmd", pid 238, jiffies 4294916898 (age 9.736s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff815f561e>] kmemleak_alloc+0x4e/0xb0
[<ffffffff8113964d>] __kmalloc+0x12d/0x1a0
[<ffffffff810bf6d1>] alloc_ftrace_hash+0x51/0x80
[<ffffffff810c0523>] __ftrace_graph_open.isra.39.constprop.46+0xa3/0x100
[<ffffffff810c05e8>] ftrace_graph_open+0x68/0xa0
[<ffffffff8114003d>] do_dentry_open.isra.1+0x1bd/0x2d0
[<ffffffff81140df7>] vfs_open+0x47/0x60
[<ffffffff81150f95>] path_openat+0x2a5/0x1020
[<ffffffff81152d6a>] do_filp_open+0x8a/0xf0
[<ffffffff811411df>] do_sys_open+0x12f/0x200
[<ffffffff811412ce>] SyS_open+0x1e/0x20
[<ffffffff815fa6e0>] entry_SYSCALL_64_fastpath+0x13/0x94
[<ffffffffffffffff>] 0xffffffffffffffff
Signed-off-by: Luis Henriques <lhenriques@suse.com>
---
kernel/trace/ftrace.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 74fdfe9ed3db..07a6ec55e3b4 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -5062,8 +5062,8 @@ ftrace_graph_release(struct inode *inode, struct file *file)
free_ftrace_hash(old_hash);
}
- out:
- kfree(fgd->new_hash);
+out:
+ free_ftrace_hash(fgd->new_hash);
kfree(fgd);
return ret;
next reply index
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-25 15:20 Luis Henriques [this message]
2017-05-25 15:45 ` Steven Rostedt
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