From: Ian Abbott <abbotti@mev.co.uk>
To: devel@driverdev.osuosl.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-kernel@vger.kernel.org, stable@vger.kernel.org,
Ian Abbott <abbotti@mev.co.uk>,
"Spencer E . Olson" <olsonse@umich.edu>
Subject: [PATCH 2/2] staging: comedi: ni_routes: allow partial routing information
Date: Tue, 14 Jan 2020 18:25:32 +0000 [thread overview]
Message-ID: <20200114182532.132058-3-abbotti@mev.co.uk> (raw)
In-Reply-To: <20200114182532.132058-1-abbotti@mev.co.uk>
This patch fixes a regression on setting up asynchronous commands to use
external trigger sources when board-specific routing information is
missing.
`ni_find_device_routes()` (called via `ni_assign_device_routes()`) finds
the table of register values for the device family and the set of valid
routes for the specific board. If both are found,
`tables->route_values` is set to point to the table of register values
for the device family and `tables->valid_routes` is set to point to the
list of valid routes for the specific board. If either is not found,
both `tables->route_values` and `tables->valid_routes` are left set at
their initial null values (initialized by `ni_assign_device_routes()`)
and the function returns `-ENODATA`.
Returning an error results in some routing functionality being disabled.
Unfortunately, leaving `table->route_values` set to `NULL` also breaks
the setting up of asynchronous commands that are configured to use
external trigger sources. Calls to `ni_check_trigger_arg()` or
`ni_check_trigger_arg_roffs()` while checking the asynchronous command
set-up would result in a null pointer dereference if
`table->route_values` is `NULL`. The null pointer dereference is fixed
in another patch, but it now results in failure to set up the
asynchronous command. That is a regression from the behavior prior to
commit 347e244884c3 ("staging: comedi: tio: implement global tio/ctr
routing") and commit 56d0b826d39f ("staging: comedi: ni_mio_common:
implement new routing for TRIG_EXT").
Change `ni_find_device_routes()` to set `tables->route_values` and/or
`tables->valid_routes` to valid information even if the other one can
only be set to `NULL` due to missing information. The function will
still return an error in that case. This should result in
`tables->valid_routes` being valid for all currently supported device
families even if the board-specific routing information is missing.
That should be enough to fix the regression on setting up asynchronous
commands to use external triggers for boards with missing routing
information.
Fixes: 347e244884c3 ("staging: comedi: tio: implement global tio/ctr routing")
Fixes: 56d0b826d39f ("staging: comedi: ni_mio_common: implement new routing for TRIG_EXT").
Cc: <stable@vger.kernel.org> # 4.20+
Cc: Spencer E. Olson <olsonse@umich.edu>
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
---
drivers/staging/comedi/drivers/ni_routes.c | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/drivers/staging/comedi/drivers/ni_routes.c b/drivers/staging/comedi/drivers/ni_routes.c
index 9627bd1d2a78..8f398b30f5bf 100644
--- a/drivers/staging/comedi/drivers/ni_routes.c
+++ b/drivers/staging/comedi/drivers/ni_routes.c
@@ -72,9 +72,6 @@ static int ni_find_device_routes(const char *device_family,
}
}
- if (!rv)
- return -ENODATA;
-
/* Second, find the set of routes valid for this device. */
for (i = 0; ni_device_routes_list[i]; ++i) {
if (memcmp(ni_device_routes_list[i]->device, board_name,
@@ -84,12 +81,12 @@ static int ni_find_device_routes(const char *device_family,
}
}
- if (!dr)
- return -ENODATA;
-
tables->route_values = rv;
tables->valid_routes = dr;
+ if (!rv || !dr)
+ return -ENODATA;
+
return 0;
}
--
2.24.1
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prev parent reply other threads:[~2020-01-14 18:26 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-14 18:25 [PATCH 0/2] staging: comedi: ni_routes: fix some regressions Ian Abbott
2020-01-14 18:25 ` [PATCH 1/2] staging: comedi: ni_routes: fix null dereference in ni_find_route_source() Ian Abbott
2020-01-14 18:25 ` Ian Abbott [this message]
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