From: Logan Gunthorpe <logang@deltatee.com>
To: linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org
Cc: Keith Busch <kbusch@kernel.org>, Jens Axboe <axboe@fb.com>,
Logan Gunthorpe <logang@deltatee.com>,
Christoph Hellwig <hch@lst.de>, Sagi Grimberg <sagi@grimberg.me>
Subject: [PATCH] nvme-multipath: Fix memory leak with ana_log_buf
Date: Thu, 20 Feb 2020 13:29:53 -0700 [thread overview]
Message-ID: <20200220202953.26139-1-logang@deltatee.com> (raw)
kmemleak reports a memory leak with the ana_log_buf allocated by
nvme_mpath_init():
unreferenced object 0xffff888120e94000 (size 8208):
comm "nvme", pid 6884, jiffies 4295020435 (age 78786.312s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 ................
01 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<00000000e2360188>] kmalloc_order+0x97/0xc0
[<0000000079b18dd4>] kmalloc_order_trace+0x24/0x100
[<00000000f50c0406>] __kmalloc+0x24c/0x2d0
[<00000000f31a10b9>] nvme_mpath_init+0x23c/0x2b0
[<000000005802589e>] nvme_init_identify+0x75f/0x1600
[<0000000058ef911b>] nvme_loop_configure_admin_queue+0x26d/0x280
[<00000000673774b9>] nvme_loop_create_ctrl+0x2a7/0x710
[<00000000f1c7a233>] nvmf_dev_write+0xc66/0x10b9
[<000000004199f8d0>] __vfs_write+0x50/0xa0
[<0000000065466fef>] vfs_write+0xf3/0x280
[<00000000b0db9a8b>] ksys_write+0xc6/0x160
[<0000000082156b91>] __x64_sys_write+0x43/0x50
[<00000000c34fbb6d>] do_syscall_64+0x77/0x2f0
[<00000000bbc574c9>] entry_SYSCALL_64_after_hwframe+0x49/0xbe
nvme_mpath_init() is called by nvme_init_identify() which is called in
multiple places (nvme_reset_work(), nvme_passthru_end(), etc). This
means nvme_mpath_init() may be called multiple times before
nvme_mpath_uninit() (which is only called on nvme_free_ctrl()).
When nvme_mpath_init() is called multiple times, it overwrites the
ana_log_buf pointer with a new allocation, thus leaking the previous
allocation.
To fix this, free ana_log_buf before allocating a new one.
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
---
drivers/nvme/host/multipath.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index 797c18337d96..a11900cf3a36 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -715,6 +715,7 @@ int nvme_mpath_init(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
}
INIT_WORK(&ctrl->ana_work, nvme_ana_work);
+ kfree(ctrl->ana_log_buf);
ctrl->ana_log_buf = kmalloc(ctrl->ana_log_size, GFP_KERNEL);
if (!ctrl->ana_log_buf) {
error = -ENOMEM;
base-commit: 11a48a5a18c63fd7621bb050228cebf13566e4d8
--
2.20.1
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next reply other threads:[~2020-02-20 20:30 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-20 20:29 Logan Gunthorpe [this message]
2020-02-20 21:12 ` [PATCH] nvme-multipath: Fix memory leak with ana_log_buf Sagi Grimberg
2020-02-20 21:14 ` Logan Gunthorpe
2020-02-21 14:15 ` Christoph Hellwig
2020-02-21 14:54 ` Keith Busch
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