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Staging: comedi: serial2002: handle allocation failures on 'open'

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The comedi device 'open' method for the serial2002 driver frees any old
'maxdata_list' and 'range_table_list' arrays belonging to a subdevice
and allocates them again, but was missing checks for allocation failure.

If an allocation fails, free the 'maxdata_list' and 'range_table_list'
arrays for all subdevices and return an error.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Ian Abbott 2010-05-19 14:10:01 +01:00 committed by Greg Kroah-Hartman
parent 3c17ba0743
commit 9e7f225688
1 changed files with 29 additions and 8 deletions
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37
drivers/staging/comedi/drivers/serial2002.c
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@ -418,6 +418,7 @@ static int serial_2002_open(struct comedi_device *dev)
struct config_t chan_out_config[32];
int i;
result = 0;
for (i = 0; i < 32; i++) {
dig_in_config[i].kind = 0;
dig_in_config[i].bits = 0;
@ -633,22 +634,23 @@ static int serial_2002_open(struct comedi_device *dev)
s = &dev->subdevices[i];
s->n_chan = chan;
s->maxdata = 0;
if (s->maxdata_list) {
kfree(s->maxdata_list);
}
kfree(s->maxdata_list);
s->maxdata_list = maxdata_list =
kmalloc(sizeof(unsigned int) * s->n_chan,
GFP_KERNEL);
if (s->range_table_list) {
kfree(s->range_table_list);
}
if (!s->maxdata_list)
break; /* error handled below */
kfree(s->range_table_list);
s->range_table = NULL;
s->range_table_list = NULL;
if (range) {
s->range_table = 0;
s->range_table_list = range_table_list =
kmalloc(sizeof
(struct
serial2002_range_table_t) *
s->n_chan, GFP_KERNEL);
if (!s->range_table_list)
break; /* err handled below */
}
for (chan = 0, j = 0; j < 32; j++) {
if (c[j].kind == kind) {
@ -674,7 +676,26 @@ static int serial_2002_open(struct comedi_device *dev)
}
}
}
result = 0;
if (i <= 4) {
/* Failed to allocate maxdata_list or range_table_list
* for a subdevice that needed it. */
result = -ENOMEM;
for (i = 0; i <= 4; i++) {
struct comedi_subdevice *s;
s = &dev->subdevices[i];
kfree(s->maxdata_list);
s->maxdata_list = NULL;
kfree(s->range_table_list);
s->range_table_list = NULL;
}
}
if (result) {
if (devpriv->tty) {
filp_close(devpriv->tty, 0);
devpriv->tty = NULL;
}
}
}
return result;
}