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From: Dennis Dalessandro <dennis.dalessandro@intel.com>
To: jgg@ziepe.ca, dledford@redhat.com
Cc: linux-rdma@vger.kernel.org,
	Mike Marciniszyn <mike.marciniszyn@intel.com>,
	stable@vger.kernel.org, Kaike Wan <kaike.wan@intel.com>
Subject: [PATCH for-rc 1/2] IB/hfi1: Fix memory leaks in sysfs registration and unregistration
Date: Thu, 26 Mar 2020 12:38:07 -0400
Message-ID: <20200326163807.21129.27371.stgit@awfm-01.aw.intel.com> (raw)
In-Reply-To: <20200326163619.21129.13002.stgit@awfm-01.aw.intel.com>

From: Kaike Wan <kaike.wan@intel.com>

When the hfi1 driver is unloaded, kmemleak will report the following
issue:

unreferenced object 0xffff8888461a4c08 (size 8):
comm "kworker/0:0", pid 5, jiffies 4298601264 (age 2047.134s)
hex dump (first 8 bytes):
73 64 6d 61 30 00 ff ff sdma0...
backtrace:
[<00000000311a6ef5>] kvasprintf+0x62/0xd0
[<00000000ade94d9f>] kobject_set_name_vargs+0x1c/0x90
[<0000000060657dbb>] kobject_init_and_add+0x5d/0xb0
[<00000000346fe72b>] 0xffffffffa0c5ecba
[<000000006cfc5819>] 0xffffffffa0c866b9
[<0000000031c65580>] 0xffffffffa0c38e87
[<00000000e9739b3f>] local_pci_probe+0x41/0x80
[<000000006c69911d>] work_for_cpu_fn+0x16/0x20
[<00000000601267b5>] process_one_work+0x171/0x380
[<0000000049a0eefa>] worker_thread+0x1d1/0x3f0
[<00000000909cf2b9>] kthread+0xf8/0x130
[<0000000058f5f874>] ret_from_fork+0x35/0x40

This patch fixes the issue by:
- Releasing dd->per_sdma[i].kobject in hfi1_unregister_sysfs().
  - This will fix the memory leak.
- Calling kobject_put() to unwind operations only for those entries in
   dd->per_sdma[] whose operations have succeeded (including the current
   one that has just failed) in hfi1_verbs_register_sysfs().

Fixes: 0cb2aa690c7e ("IB/hfi1: Add sysfs interface for affinity setup")
Cc: <stable@vger.kernel.org>
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
---
 drivers/infiniband/hw/hfi1/sysfs.c |   13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/hfi1/sysfs.c b/drivers/infiniband/hw/hfi1/sysfs.c
index 90f62c4..f1bcecf 100644
--- a/drivers/infiniband/hw/hfi1/sysfs.c
+++ b/drivers/infiniband/hw/hfi1/sysfs.c
@@ -853,8 +853,13 @@ int hfi1_verbs_register_sysfs(struct hfi1_devdata *dd)
 
 	return 0;
 bail:
-	for (i = 0; i < dd->num_sdma; i++)
-		kobject_del(&dd->per_sdma[i].kobj);
+	/*
+	 * The function kobject_put() will call kobject_del() if the kobject
+	 * has been added successfully. The sysfs files created under the
+	 * kobject directory will also be removed during the process.
+	 */
+	for (; i >= 0; i--)
+		kobject_put(&dd->per_sdma[i].kobj);
 
 	return ret;
 }
@@ -867,6 +872,10 @@ void hfi1_verbs_unregister_sysfs(struct hfi1_devdata *dd)
 	struct hfi1_pportdata *ppd;
 	int i;
 
+	/* Unwind operations in hfi1_verbs_register_sysfs() */
+	for (i = 0; i < dd->num_sdma; i++)
+		kobject_put(&dd->per_sdma[i].kobj);
+
 	for (i = 0; i < dd->num_pports; i++) {
 		ppd = &dd->pport[i];
 


  reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-26 16:37 [PATCH for-rc 0/2] Pre-req for hfi1 cdev rework Dennis Dalessandro
2020-03-26 16:38 ` Dennis Dalessandro [this message]
2020-03-26 17:25   ` [PATCH for-rc 1/2] IB/hfi1: Fix memory leaks in sysfs registration and unregistration Jason Gunthorpe
2020-03-26 19:09     ` Wan, Kaike
2020-03-26 19:42       ` Jason Gunthorpe
2020-03-26 22:24         ` Wan, Kaike
2020-03-26 22:36           ` Jason Gunthorpe
2020-03-26 23:30             ` Wan, Kaike
2020-03-26 16:38 ` [PATCH for-rc 2/2] IB/hfi1: Call kobject_put() when kobject_init_and_add() fails Dennis Dalessandro
2020-03-26 16:40   ` Dennis Dalessandro
2020-03-27 16:14 ` [PATCH for-rc 0/2] Pre-req for hfi1 cdev rework Jason Gunthorpe

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