This is a note to let you know that I've just added the patch titled
staging: comedi: bug-fix NULL pointer dereference on failed attach
to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
staging-comedi-bug-fix-null-pointer-dereference-on-failed-attach.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 3955dfa8216f712bc204a5ad2f4e51efff252fde Mon Sep 17 00:00:00 2001
From: Ian Abbott <[email protected]>
Date: Fri, 23 Aug 2013 12:37:17 +0100
Subject: staging: comedi: bug-fix NULL pointer dereference on failed attach
From: Ian Abbott <[email protected]>
commit 3955dfa8216f712bc204a5ad2f4e51efff252fde upstream.
Commit dcd7b8bd63cb81c5b973bf86510ca3c80bbbd162 ("staging: comedi: put
module _after_ detach" by myself) reversed a couple of calls in
`comedi_device_attach()` when recovering from an error returned by the
low-level driver's 'attach' handler. Unfortunately, that introduced a
NULL pointer dereference bug as `dev->driver` is NULL after the call to
`comedi_device_detach()`. We still have a pointer to the low-level
comedi driver structure in the `driv` variable, so use that instead.
Signed-off-by: Ian Abbott <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/staging/comedi/drivers.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/staging/comedi/drivers.c
+++ b/drivers/staging/comedi/drivers.c
@@ -464,7 +464,7 @@ int comedi_device_attach(struct comedi_d
ret = comedi_device_postconfig(dev);
if (ret < 0) {
comedi_device_detach(dev);
- module_put(dev->driver->module);
+ module_put(driv->module);
}
/* On success, the driver module count has been incremented. */
return ret;
Patches currently in stable-queue which might be from [email protected] are
queue-3.10/staging-comedi-bug-fix-null-pointer-dereference-on-failed-attach.patch
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