Added check against maxdata for write instructions.

diff --git a/comedi/comedi_fops.c b/comedi/comedi_fops.c
index d1a69a86af7491e93f2c11cd312afddcf37ad8c3..29134bdc140f3c4a444e0f7d2f605b18fe791328 100644 (file)
--- a/comedi/comedi_fops.c
+++ b/comedi/comedi_fops.c
@@ -663,6 +663,7 @@ static int parse_insn(comedi_device *dev,comedi_insn *insn,lsampl_t *data,void *
 {
        comedi_subdevice *s;
        int ret = 0;
+       int i;
 
        if(insn->insn&INSN_MASK_SPECIAL){
                /* a non-subdevice instruction */
@@ -760,8 +761,12 @@ static int parse_insn(comedi_device *dev,comedi_insn *insn,lsampl_t *data,void *
                                ret=s->insn_read(dev,s,insn,data);
                                break;
                        case INSN_WRITE:
-                               //XXX check against subdevice's maxdata
-                               ret=s->insn_write(dev,s,insn,data);
+                               for(i = 0; i < insn->n; ++i)
+                               {
+                                       if(data[i] > s->maxdata) ret = -EINVAL;
+                               }
+                               if(ret == 0)
+                                       ret = s->insn_write(dev,s,insn,data);
                                break;
                        case INSN_BITS:
                                if(insn->n != 2)