[Suggestion] ARM:kernel: memcpy, checking the length before copy.

[Suggestion] ARM:kernel: memcpy, checking the length before copy.

[Chen Gang]

Hello Russell King:

in arch/arm/kernel/fiq.c:

  since the function set_fiq_handler is an EXPORT_SYMBOL function.
  do we need checking memory length, before copy ?
    (have to understand the madly using by outside users)

  if really it is, maybe also need provide the return value for failure.


  Regards

gchen.


 80 void set_fiq_handler(void *start, unsigned int length)
 81 {
 82 #if defined(CONFIG_CPU_USE_DOMAINS)
 83         memcpy((void *)0xffff001c, start, length);
 84 #else
 85         memcpy(vectors_page + 0x1c, start, length);
 86 #endif
 87         flush_icache_range(0xffff001c, 0xffff001c + length);
 88         if (!vectors_high())
 89                 flush_icache_range(0x1c, 0x1c + length);
 90 }
 91 
...

137 EXPORT_SYMBOL(set_fiq_handler);