cx23885: Incorrect argument passed to videobuf_dma_unmap

Bug #800527 reported by Jeremy Kerr on 2011-06-22
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux (Ubuntu)

Bug Description

In the maverick kernel, the commit bcbfc24 introduced the following change to the cx23885 driver:

@@ -1142,7 +1142,7 @@ void cx23885_free_buffer
        videobuf_waiton(&buf->vb, 0, 0);
- videobuf_dma_unmap(q, dma);
+ videobuf_dma_unmap(q->dev, dma);
        btcx_riscmem_free(to_pci_dev(q->dev), &buf->risc);

However, videobuf_dma_unmap expects a struct videobuf_queue * as its first argument, not struct device *. This change is for a new API introduced after 2.6.35, and so is not in the v4l code in maverick.

Jeremy Kerr (jk-ozlabs) wrote :

Patch coming...

Jeremy Kerr (jk-ozlabs) wrote :

Just to clarify: bcbfc24 is a sauce patch that backports some IR stuff from post-2.6.35. The cx23885-core changes must have snuck in unintentionally.

Stefan Bader (smb) on 2011-06-22
Changed in linux (Ubuntu):
status: New → Invalid
Herton R. Krzesinski (herton) wrote :

This bug is missing the SRU Justification text in the description or in a comment, please update it.

Also it is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-maverick' to 'verification-done-maverick'.

If verification is not done by one week from today, this fix will be dropped from the source code, and this bug will be closed.

See for documentation how to enable and use -proposed. Thank you!

tags: added: verification-needed-maverick
Jeremy Kerr (jk-ozlabs) wrote :

SRU Justification:

Impact: Currently, the kernel build produces a warning on the cx23885-core.c:

drivers/media/video/cx23885/cx23885-core.c: In function ‘cx23885_free_buffer’:
drivers/media/video/cx23885/cx23885-core.c:1146:2: warning: passing argument 1 of ‘videobuf_dma_unmap’ from incompatible pointer type
include/media/videobuf-dma-sg.h:100:5: note: expected ‘struct videobuf_queue *’ but argument is of type ‘struct device *’

- this *may* indicate that video buffers are not properly freed after use

Fix: With this fix applied, the warning is no longer present

Jeremy Kerr (jk-ozlabs) wrote :

I can confirm that the current git HEAD (4419a4ff8) does not produce this warning. Do you need further verification though?

Jeremy Kerr (jk-ozlabs) wrote :

Assuming yes. I will track down some hardware to build a testcase.

Jeremy Kerr (jk-ozlabs) wrote :

I've only had access to 32-bit installs so far, with which this error looks fairly innocuous (looks like the dev argument isn't used to establish mappings on 32-bit). However, on 64-bit, it appears that the incorrect dev pointer code causes an oops (specified in bug 659348).

I've put a call for testing on that bug, that should show a fix with the -proposed kernel.

Steve Conklin (sconklin) wrote :

We're going to let this go until Monday, and then we'll revert the patch if we don't have verification that the kernel in -proposed resolves the issue.

Jeremy Kerr (jk-ozlabs) wrote :

Steve - understood. I have no HW to test this on (looks like we need a 64-bit machine with an IOMMU), so can't help out here. So, we're waiting on the folks on bug 659348 to test.

Steve Conklin (sconklin) wrote :

After discussion among the kernel team, and inspection of the patch, here is the concensus:

This patch looks obviously correct by inspection, and should only affect users of this device.
This kernel has been tested with a number of other PCI devices, and is not broken for any other device.

Therefore, we will leave this patch in the kernel and not revert it.

tags: added: verification-done-maverick
removed: verification-needed-maverick
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package linux - 2.6.35-30.56

linux (2.6.35-30.56) maverick-proposed; urgency=low

  [Herton R. Krzesinski]

  * Release Tracking Bug
    - LP: #808934

  [ Herton Ronaldo Krzesinski ]

  * Revert "SAUCE: mmc: Enable MMC card reader for RICOH [1180:e823]"

  [ Upstream Kernel Changes ]

  * Revert "x86: Flush TLB if PGD entry is changed in i386 PAE mode"
    - LP: #805209

linux (2.6.35-30.55) maverick-proposed; urgency=low

  [Steve Conklin]

  * Release Tracking Bug
    - LP: #801690

  [ Jeremy Kerr ]

  * SAUCE: cx23885: Fix argument to videobuf_dma_unmap
    - LP: #800527

  [ Manoj Iyer ]

  * SAUCE: mmc: Enable MMC card reader for RICOH [1180:e823]
    - LP: #790754

  [ Upstream Kernel Changes ]

  * agp: fix OOM and buffer overflow
    - LP: #791918
    - CVE-2011-1746
  * tty: icount changeover for other main devices, CVE-2010-4076,
    - LP: #720189
    - CVE-2010-4077
  * fs/partitions/efi.c: corrupted GUID partition tables can cause kernel
    - LP: #795418
    - CVE-2011-1577
  * Fix corrupted OSF partition table parsing
    - LP: #796606
    - CVE-2011-1163
  * can: Add missing socket check in can/bcm release.
    - LP: #796502
    - CVE-2011-1598
  * nfs4: Ensure that ACL pages sent over NFS were not allocated from the
    slab (v3) CVE-2011-1090
    - LP: #800775
    - CVE-2011-1090
 -- Herton Ronaldo Krzesinski <email address hidden> Mon, 11 Jul 2011 15:17:32 -0300

Changed in linux (Ubuntu Maverick):
status: New → Fix Released
To post a comment you must log in.
This report contains Public information  Edit
Everyone can see this information.

Other bug subscribers