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mei: allow map and unmap of client dma buffer only for disconnected client

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Allow map and unmap of the client dma buffer only when the client is not
connected. The functions return -EPROTO if the client is already connected.
This is to fix the race when traffic may start or stop when buffer
is not available.

Cc: <stable@vger.kernel.org> #v5.11+
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Link: https://lore.kernel.org/r/20210318055959.305627-1-tomas.winkler@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tomas Winkler 2021-03-18 07:59:59 +02:00 • committed by Greg Kroah-Hartman
parent 903079a54c
commit ce068bc7da
1 changed files with 7 additions and 10 deletions
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17
drivers/misc/mei/client.c
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@ -2286,8 +2286,8 @@ int mei_cl_dma_alloc_and_map(struct mei_cl *cl, const struct file *fp,
if (buffer_id == 0)
return -EINVAL;
if (!mei_cl_is_connected(cl))
return -ENODEV;
if (mei_cl_is_connected(cl))
return -EPROTO;
if (cl->dma_mapped)
return -EPROTO;
@ -2327,9 +2327,7 @@ int mei_cl_dma_alloc_and_map(struct mei_cl *cl, const struct file *fp,
mutex_unlock(&dev->device_lock);
wait_event_timeout(cl->wait,
cl->dma_mapped ||
cl->status ||
!mei_cl_is_connected(cl),
cl->dma_mapped || cl->status,
mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
mutex_lock(&dev->device_lock);
@ -2376,8 +2374,9 @@ int mei_cl_dma_unmap(struct mei_cl *cl, const struct file *fp)
return -EOPNOTSUPP;
}
if (!mei_cl_is_connected(cl))
return -ENODEV;
/* do not allow unmap for connected client */
if (mei_cl_is_connected(cl))
return -EPROTO;
if (!cl->dma_mapped)
return -EPROTO;
@ -2405,9 +2404,7 @@ int mei_cl_dma_unmap(struct mei_cl *cl, const struct file *fp)
mutex_unlock(&dev->device_lock);
wait_event_timeout(cl->wait,
!cl->dma_mapped ||
cl->status ||
!mei_cl_is_connected(cl),
!cl->dma_mapped || cl->status,
mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
mutex_lock(&dev->device_lock);