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rapidio: handle create_workqueue() failure

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commit 69ce3ae36d upstream.

In case create_workqueue() fails, release all resources and return -ENOMEM
to caller to avoid potential NULL pointer deref later. Move up the
create_workequeue() call to return early and avoid unwinding the call to
riocm_rx_fill().

Cc: Alexandre Bounine <alex.bou9@gmail.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Anirudh Rayabharam <mail@anirudhrb.com>
Link: https://lore.kernel.org/r/20210503115736.2104747-46-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Anirudh Rayabharam 2021-05-03 13:57:12 +02:00 • committed by Greg Kroah-Hartman
commit 1ba7a534a9
1 changed files with 8 additions and 1 deletions
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9
drivers/rapidio/rio_cm.c
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@ -2127,6 +2127,14 @@ static int riocm_add_mport(struct device *dev,
return -ENODEV;
}
cm->rx_wq = create_workqueue(DRV_NAME "/rxq");
if (!cm->rx_wq) {
rio_release_inb_mbox(mport, cmbox);
rio_release_outb_mbox(mport, cmbox);
kfree(cm);
return -ENOMEM;
}
/*
* Allocate and register inbound messaging buffers to be ready
* to receive channel and system management requests
@ -2137,7 +2145,6 @@ static int riocm_add_mport(struct device *dev,
cm->rx_slots = RIOCM_RX_RING_SIZE;
mutex_init(&cm->rx_lock);
riocm_rx_fill(cm, RIOCM_RX_RING_SIZE);
cm->rx_wq = create_workqueue(DRV_NAME "/rxq");
INIT_WORK(&cm->rx_work, rio_ibmsg_handler);
cm->tx_slot = 0;