diff options
| author |   Anirudh Rayabharam <mail@anirudhrb.com> | 2021-05-03 13:57:12 +0200 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-13 18:32:19 +0200 |
| commit | 69ce3ae36dcb03cdf416b0862a45369ddbf50fdf (patch) | |
| tree | 463a29cf7fcf17a287c0cb78f553bf1b675709c2 /drivers/rapidio | |
| parent | Revert "rapidio: fix a NULL pointer dereference when create_workqueue() fails" (diff) | |
| download | linux-dev-69ce3ae36dcb03cdf416b0862a45369ddbf50fdf.tar.xz linux-dev-69ce3ae36dcb03cdf416b0862a45369ddbf50fdf.zip | |
rapidio: handle create_workqueue() failure
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>
Diffstat (limited to 'drivers/rapidio')
| -rw-r--r-- | drivers/rapidio/rio_cm.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/rapidio/rio_cm.c b/drivers/rapidio/rio_cm.c index e6c16f04f2b4..db4c265287ae 100644 --- a/drivers/rapidio/rio_cm.c +++ b/drivers/rapidio/rio_cm.c @@ -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; |