diff options
| author | Ian Abbott <abbotti@mev.co.uk> | 2012-10-03 16:25:19 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-10-22 11:46:35 -0700 |
| commit | 1d1171ffda585c1cab7bd7cf4bd8f8fd5923fb4a (patch) | |
| tree | dc2fde3ce7225436cc9adfcb78a9503c03efc9c2 /drivers/staging | |
| parent | 2db012bd40b889d8e5483d3daa07af04c4c109d8 (diff) | |
staging: comedi: amplc_pc263: fix possible NULL deref during detach
`pc263_detach()` is called by the comedi core to clean up if either
`pc263_attach()` or `pc263_attach_pci()` returns an error. It sets
`thisboard` to the return value of `comedi_board(dev)` and assumes it is
non-null. This is a valid assumption if `pc263_attach()` fails, but not
if `pc263_attach_pci()` fails, leading to a possible NULL pointer
dereference.
Check `thisboard` at the top of `pc263_detach()` and return early if it
is `NULL`. This is okay because no other resources need cleaning up in
this case.
Cc: <stable@vger.kernel.org> # 3.6.x
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging')
| -rw-r--r-- | drivers/staging/comedi/drivers/amplc_pc263.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/staging/comedi/drivers/amplc_pc263.c b/drivers/staging/comedi/drivers/amplc_pc263.c index 60830ccfb90..d0a4c441228 100644 --- a/drivers/staging/comedi/drivers/amplc_pc263.c +++ b/drivers/staging/comedi/drivers/amplc_pc263.c @@ -323,6 +323,8 @@ static void pc263_detach(struct comedi_device *dev) { const struct pc263_board *thisboard = comedi_board(dev); + if (!thisboard) + return; if (is_isa_board(thisboard)) { if (dev->iobase) release_region(dev->iobase, PC263_IO_SIZE); |