This is a note to let you know that I've just added the patch titled
staging: comedi: comedi_compat32.c: fix COMEDI_CMD copy back
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-comedi_compat32.c-fix-comedi_cmd-copy-back.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 <stable@xxxxxxxxxxxxxxx> know about it.
>From 42b8ce6f55facfa101462e694d33fc6bca471138 Mon Sep 17 00:00:00 2001
From: Ian Abbott <abbotti@xxxxxxxxx>
Date: Tue, 27 Jan 2015 18:16:51 +0000
Subject: staging: comedi: comedi_compat32.c: fix COMEDI_CMD copy back
From: Ian Abbott <abbotti@xxxxxxxxx>
commit 42b8ce6f55facfa101462e694d33fc6bca471138 upstream.
`do_cmd_ioctl()` in "comedi_fops.c" handles the `COMEDI_CMD` ioctl.
This returns `-EAGAIN` if it has copied a modified `struct comedi_cmd`
back to user-space. (This occurs when the low-level Comedi driver's
`do_cmdtest()` handler returns non-zero to indicate a problem with the
contents of the `struct comedi_cmd`, or when the `struct comedi_cmd` has
the `CMDF_BOGUS` flag set.)
`compat_cmd()` in "comedi_compat32.c" handles the 32-bit compatible
version of the `COMEDI_CMD` ioctl. Currently, it never copies a 32-bit
compatible version of `struct comedi_cmd` back to user-space, which is
at odds with the way the regular `COMEDI_CMD` ioctl is handled. To fix
it, change `compat_cmd()` to copy a 32-bit compatible version of the
`struct comedi_cmd` back to user-space when the main ioctl handler
returns `-EAGAIN`.
Signed-off-by: Ian Abbott <abbotti@xxxxxxxxx>
Reviewed-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/comedi/comedi_compat32.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
--- a/drivers/staging/comedi/comedi_compat32.c
+++ b/drivers/staging/comedi/comedi_compat32.c
@@ -270,7 +270,7 @@ static int compat_cmd(struct file *file,
{
struct comedi_cmd __user *cmd;
struct comedi32_cmd_struct __user *cmd32;
- int rc;
+ int rc, err;
cmd32 = compat_ptr(arg);
cmd = compat_alloc_user_space(sizeof(*cmd));
@@ -279,7 +279,15 @@ static int compat_cmd(struct file *file,
if (rc)
return rc;
- return translated_ioctl(file, COMEDI_CMD, (unsigned long)cmd);
+ rc = translated_ioctl(file, COMEDI_CMD, (unsigned long)cmd);
+ if (rc == -EAGAIN) {
+ /* Special case: copy cmd back to user. */
+ err = put_compat_cmd(cmd32, cmd);
+ if (err)
+ rc = err;
+ }
+
+ return rc;
}
/* Handle 32-bit COMEDI_CMDTEST ioctl. */
Patches currently in stable-queue which might be from abbotti@xxxxxxxxx are
queue-3.10/staging-comedi-comedi_compat32.c-fix-comedi_cmd-copy-back.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html