DMA Engine development
 help / color / mirror / Atom feed
From: Dave Jiang <dave.jiang@intel.com>
To: vkoul@kernel.org
Cc: dmaengine@vger.kernel.org
Subject: [PATCH] dmaengine: idxd: check return result from check_vma() in cdev
Date: Tue, 25 Feb 2020 09:47:46 -0700	[thread overview]
Message-ID: <158264926659.9387.14325163515683047959.stgit@djiang5-desk3.ch.intel.com> (raw)

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>
---
 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 1d7347825b95..1706a48d8bbe 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,


             reply	other threads:[~2020-02-25 16:47 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-25 16:47 Dave Jiang [this message]
2020-03-02  7:14 ` [PATCH] dmaengine: idxd: check return result from check_vma() in cdev Vinod Koul

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=158264926659.9387.14325163515683047959.stgit@djiang5-desk3.ch.intel.com \
    --to=dave.jiang@intel.com \
    --cc=dmaengine@vger.kernel.org \
    --cc=vkoul@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox