From: Dave Jiang dave.jiang@intel.com
[ Upstream commit b391554c61cb353c279523a706734b090aaf9000 ]
The returned result from the check_vma() function in the cdev ->mmap() call needs to be handled. Add the check and returning error.
Fixes: 42d279f9137a ("dmaengine: idxd: add char driver to expose submission portal to userland") Reported-by: Vinod Koul vkoul@kernel.org Signed-off-by: Dave Jiang dave.jiang@intel.com Link: https://lore.kernel.org/r/158264926659.9387.14325163515683047959.stgit@djian... Signed-off-by: Vinod Koul vkoul@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/dma/idxd/cdev.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/dma/idxd/cdev.c b/drivers/dma/idxd/cdev.c index 989b7a25ca614..677ccbe6261f4 100644 --- a/drivers/dma/idxd/cdev.c +++ b/drivers/dma/idxd/cdev.c @@ -139,6 +139,8 @@ static int idxd_cdev_mmap(struct file *filp, struct vm_area_struct *vma)
dev_dbg(&pdev->dev, "%s called\n", __func__); rc = check_vma(wq, vma, __func__); + if (rc < 0) + return rc;
vma->vm_flags |= VM_DONTCOPY; pfn = (base + idxd_get_wq_portal_full_offset(wq->id,