From: Tomas Winkler <tomas.winkler@intel.com>
To: gregkh@linuxfoundation.org
Cc: arnd@arndb.de, linux-kernel@vger.kernel.org,
stable@vger.kernel.org,
Alexander Usyskin <alexander.usyskin@intel.com>,
Tomas Winkler <tomas.winkler@intel.com>
Subject: [char-misc 2/2] mei: don't unset read cb ptr on reset
Date: Mon, 27 Jan 2014 22:27:24 +0200 [thread overview]
Message-ID: <1390854444-30650-3-git-send-email-tomas.winkler@intel.com> (raw)
In-Reply-To: <1390854444-30650-1-git-send-email-tomas.winkler@intel.com>
From: Alexander Usyskin <alexander.usyskin@intel.com>
Don't set read callback to NULL during reset as
this leads to memory leak of both cb and its buffer.
The memory is correctly freed during mei_release.
The memory leak is detectable by kmemleak if
application has open read call while system is going through
suspend/resume.
unreferenced object 0xecead780 (size 64):
comm "AsyncTask #1", pid 1018, jiffies 4294949621 (age 152.440s)
hex dump (first 32 bytes):
00 01 10 00 00 02 20 00 00 bf 30 f1 00 00 00 00 ...... ...0.....
00 00 00 00 00 00 00 00 36 01 00 00 00 70 da e2 ........6....p..
backtrace:
[<c1a60aec>] kmemleak_alloc+0x3c/0xa0
[<c131ed56>] kmem_cache_alloc_trace+0xc6/0x190
[<c16243c9>] mei_io_cb_init+0x29/0x50
[<c1625722>] mei_cl_read_start+0x102/0x360
[<c16268f3>] mei_read+0x103/0x4e0
[<c1324b09>] vfs_read+0x89/0x160
[<c1324d5f>] SyS_read+0x4f/0x80
[<c1a7b318>] syscall_call+0x7/0xb
[<ffffffff>] 0xffffffff
unreferenced object 0xe2da7000 (size 512):
comm "AsyncTask #1", pid 1018, jiffies 4294949621 (age 152.440s)
hex dump (first 32 bytes):
00 6c da e2 7c 00 00 00 00 00 00 00 c0 eb 0c 59 .l..|..........Y
1b 00 00 00 01 00 00 00 02 10 00 00 01 00 00 00 ................
backtrace:
[<c1a60aec>] kmemleak_alloc+0x3c/0xa0
[<c131f127>] __kmalloc+0xe7/0x1d0
[<c162447e>] mei_io_cb_alloc_resp_buf+0x2e/0x60
[<c162574c>] mei_cl_read_start+0x12c/0x360
[<c16268f3>] mei_read+0x103/0x4e0
[<c1324b09>] vfs_read+0x89/0x160
[<c1324d5f>] SyS_read+0x4f/0x80
[<c1a7b318>] syscall_call+0x7/0xb
[<ffffffff>] 0xffffffff
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
drivers/misc/mei/client.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index 8bf2034..23455c7 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -926,7 +926,6 @@ void mei_cl_all_disconnect(struct mei_device *dev)
list_for_each_entry_safe(cl, next, &dev->file_list, link) {
cl->state = MEI_FILE_DISCONNECTED;
cl->mei_flow_ctrl_creds = 0;
- cl->read_cb = NULL;
cl->timer_count = 0;
}
}
--
1.8.5.3
prev parent reply other threads:[~2014-01-27 20:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-27 20:27 [char-misc 0/2] mei: memory leak fixes Tomas Winkler
2014-01-27 20:27 ` [char-misc 1/2] mei: clear write cb from waiting list on reset Tomas Winkler
2014-01-27 20:27 ` Tomas Winkler [this message]
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