From: Alexander Usyskin alexander.usyskin@intel.com

Don't blindly copy status value received from the firmware into internal client status field, It may be positive and ERR_PTR(ret) will translate it into an invalid address and the caller will crash.

Put the error code into the client status on failure.

Fixes: 369aea845951 ("mei: implement client dma setup.") Reported-by: Emmanuel Grumbach emmanuel.grumbach@intel.com Cc: stable@vger.kernel.org # v5.11+ Acked-by: Tomas Winkler tomas.winkler@intel.com Signed-off-by: Alexander Usyskin alexander.usyskin@intel.com Signed-off-by: Tomas Winkler tomas.winkler@intel.com --- drivers/misc/mei/hbm.c | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c index be41843df75b..cebcca6d6d3e 100644 --- a/drivers/misc/mei/hbm.c +++ b/drivers/misc/mei/hbm.c @@ -672,10 +672,14 @@ static void mei_hbm_cl_dma_map_res(struct mei_device *dev, if (!cl) return;

- dev_dbg(dev->dev, "cl dma map result = %d\n", res->status); - cl->status = res->status; - if (!cl->status) + if (res->status) { + dev_err(dev->dev, "cl dma map failed %d\n", res->status); + cl->status = -EFAULT; + } else { + dev_dbg(dev->dev, "cl dma map succeeded\n"); cl->dma_mapped = 1; + cl->status = 0; + } wake_up(&cl->wait); }

@@ -698,10 +702,14 @@ static void mei_hbm_cl_dma_unmap_res(struct mei_device *dev, if (!cl) return;

- dev_dbg(dev->dev, "cl dma unmap result = %d\n", res->status); - cl->status = res->status; - if (!cl->status) + if (res->status) { + dev_err(dev->dev, "cl dma unmap failed %d\n", res->status); + cl->status = -EFAULT; + } else { + dev_dbg(dev->dev, "cl dma unmap succeeded\n"); cl->dma_mapped = 0; + cl->status = 0; + } wake_up(&cl->wait); }