For some reason, the driver does not consider allocation of the
subdevice private data to be a fatal error when attaching the COMEDI
device. It tests the subdevice private data pointer for validity at
certain points, but omits some crucial tests. In particular,
`jr3_pci_auto_attach()` calls `jr3_pci_alloc_spriv()` to allocate and
initialize the subdevice private data, but the same function
subsequently dereferences the pointer to access the `next_time_min` and
`next_time_max` members without checking it first. The other missing
test is in the timer expiry routine `jr3_pci_poll_dev()`, but it will
crash before it gets that far.
Fix the bug by returning `-ENOMEM` from `jr3_pci_auto_attach()` as soon
as one of the calls to `jr3_pci_alloc_spriv()` returns `NULL`. The
COMEDI core will subsequently call `jr3_pci_detach()` to clean up.
Cc: <sta...@vger.kernel.org> # 3.15+
Signed-off-by: Ian Abbott <abbo...@mev.co.uk>
---
drivers/staging/comedi/drivers/jr3_pci.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/drivers/staging/comedi/drivers/jr3_pci.c
b/drivers/staging/comedi/drivers/jr3_pci.c
index 70390de66e0e..25909a936e7c 100644
--- a/drivers/staging/comedi/drivers/jr3_pci.c
+++ b/drivers/staging/comedi/drivers/jr3_pci.c
@@ -727,11 +727,12 @@ static int jr3_pci_auto_attach(struct comedi_device *dev,
s->insn_read = jr3_pci_ai_insn_read;
spriv = jr3_pci_alloc_spriv(dev, s);
- if (spriv) {
- /* Channel specific range and maxdata */
- s->range_table_list = spriv->range_table_list;
- s->maxdata_list = spriv->maxdata_list;
- }
+ if (!spriv)
+ return -ENOMEM;
+
+ /* Channel specific range and maxdata */
+ s->range_table_list = spriv->range_table_list;
+ s->maxdata_list = spriv->maxdata_list;
}
/* Reset DSP card */
--
2.11.0
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