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staging: comedi: ni_routes: fix null dereference in ni_find_route_source() 

In `ni_find_route_source()`, `tables->route_values` gets dereferenced.
However it is possible that `tables->route_values` is `NULL`, leading to
a null pointer dereference.  `tables->route_values` will be `NULL` if
the call to `ni_assign_device_routes()` during board initialization
returned an error due to missing device family routing information or
missing board-specific routing information.  For example, there is
currently no board-specific routing information provided for the
PCIe-6251 board and several other boards, so those are affected by this
bug.

The bug is triggered when `ni_find_route_source()` is called via
`ni_check_trigger_arg()` or `ni_check_trigger_arg_roffs()` when checking
the arguments for setting up asynchronous commands.  Fix it by returning
`-EINVAL` if `tables->route_values` is `NULL`.

Even with this fix, setting up asynchronous commands to use external
trigger sources for boards with missing routing information will still
fail gracefully.  Since `ni_find_route_source()` only depends on the
device family routing information, it would be better if that was made
available even if the board-specific routing information is missing.
That will be addressed by another patch.

Fixes: 4bb90c87ab ("staging: comedi: add interface to ni routing table information")
Cc: <stable@vger.kernel.org> # 4.20+
Cc: Spencer E. Olson <olsonse@umich.edu>
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Link: https://lore.kernel.org/r/20200114182532.132058-2-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2020-01-14 18:25:31 +00:00 committed by Greg Kroah-Hartman
parent bc80573ea2
commit 01e20b664f
1 changed files with 3 additions and 0 deletions
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3
drivers/staging/comedi/drivers/ni_routes.c
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@ -487,6 +487,9 @@ int ni_find_route_source(const u8 src_sel_reg_value, int dest,
{
int src;
if (!tables->route_values)
return -EINVAL;
dest = B(dest); /* subtract NI names offset */
/* ensure we are not going to under/over run the route value table */
if (dest < 0 || dest >= NI_NUM_NAMES)