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scsi: scsi_dh_alua: Fix memleak for 'qdata' in alua_activate()

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[ Upstream commit a13faca032 ]

If alua_rtpg_queue() failed from alua_activate(), then 'qdata' is not
freed, which will cause following memleak:

unreferenced object 0xffff88810b2c6980 (size 32):
  comm "kworker/u16:2", pid 635322, jiffies 4355801099 (age 1216426.076s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    40 39 24 c1 ff ff ff ff 00 f8 ea 0a 81 88 ff ff  @9$.............
  backtrace:
    [<0000000098f3a26d>] alua_activate+0xb0/0x320
    [<000000003b529641>] scsi_dh_activate+0xb2/0x140
    [<000000007b296db3>] activate_path_work+0xc6/0xe0 [dm_multipath]
    [<000000007adc9ace>] process_one_work+0x3c5/0x730
    [<00000000c457a985>] worker_thread+0x93/0x650
    [<00000000cb80e628>] kthread+0x1ba/0x210
    [<00000000a1e61077>] ret_from_fork+0x22/0x30

Fix the problem by freeing 'qdata' in error path.

Fixes: 625fe857e4 ("scsi: scsi_dh_alua: Check scsi_device_get() return value")
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Link: https://lore.kernel.org/r/20230315062154.668812-1-yukuai1@huaweicloud.com
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yu Kuai 2023-03-15 14:21:54 +08:00 committed by Greg Kroah-Hartman
parent a0de3f29d8
commit 1c55982beb
1 changed files with 4 additions and 2 deletions
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6
drivers/scsi/device_handler/scsi_dh_alua.c
View file

@ -1117,10 +1117,12 @@ static int alua_activate(struct scsi_device *sdev,
rcu_read_unlock();
mutex_unlock(&h->init_mutex);
if (alua_rtpg_queue(pg, sdev, qdata, true))
if (alua_rtpg_queue(pg, sdev, qdata, true)) {
fn = NULL;
else
} else {
kfree(qdata);
err = SCSI_DH_DEV_OFFLINED;
}
kref_put(&pg->kref, release_port_group);
out:
if (fn)