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dmaengine: idxd: check return result from check_vma() in cdev
author
Dave Jiang
<dave.jiang@intel.com>
Tue, 25 Feb 2020 16:47:46 +0000
(09:47 -0700)
committer
Vinod Koul
<vkoul@kernel.org>
Mon, 2 Mar 2020 07:13:49 +0000
(12:43 +0530)
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@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
drivers/dma/idxd/cdev.c
patch
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diff --git
a/drivers/dma/idxd/cdev.c
b/drivers/dma/idxd/cdev.c
index
8dfdbe3
..
8f323e7
100644
(file)
--- a/
drivers/dma/idxd/cdev.c
+++ b/
drivers/dma/idxd/cdev.c
@@
-137,6
+137,8
@@
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,