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Kernel Panic while trying to access the datastructure parameter in ioctl call.

Subject: Kernel Panic while trying to access the datastructure parameter in ioctl call.
From: JanakiRam <email@hidden>
Date: Thu, 19 Jul 2007 00:10:02 +0530
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Hi ALL,

          I'm doing maintainance of one application which has user space daemon and kernel extension.

          The User daemon sends the command to kernel extension using ioctl command. I've a application specific structure which is being passed as a parameter.

  This structure object is available in kernel extension in ioctl function pointer registered in kext start function.

My Custom Structure looks like this.

typedef struct {
  /* input */
  long version;
  long  b;
  long  c;
  long d;
  long e;
  long f;
  long g;
  long bytes;
  char * dptr;                  /* points to the data field  */
  long filler[4];
} IOCTL_Struct_t;

    The problem is the kernel panic is comming up when i try to access the data in kernel function.

int ioctl_functionpointer(dev_t dev, u_long cmd, caddr_t arg,int fflag, struct proc *p)
{

  IOCTL_Struct_t*ctl = (PF_Ctl_t*)arg;
  char data[2048];

   if (!ctl) {

   return -1;
   }

         if ((ctl->dptr) ) {

        int res = copyin((void *)ctl->dptr, (void *)data, ctl->bytes);
            if (res != 0)
           printf ("error in copyin");
         }
return 0;

}

        If i comment the line copyin function call , then its working fine.

       I've tried to use the copyinstr instead of copyin , then also its showing panic screen.

Please help me to solve this.

Thanks in Advance.

-JanakiRam.

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