diff options
Diffstat (limited to 'fs/select.c')
| -rw-r--r-- | fs/select.c | 44 |
1 files changed, 5 insertions, 39 deletions
diff --git a/fs/select.c b/fs/select.c index 5b524a977d91..9d5f15ed87fe 100644 --- a/fs/select.c +++ b/fs/select.c @@ -1161,59 +1161,25 @@ static int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset, unsigned long *fdset) { - nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS); if (ufdset) { - unsigned long odd; - - if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t))) - return -EFAULT; - - odd = nr & 1UL; - nr &= ~1UL; - while (nr) { - unsigned long h, l; - if (__get_user(l, ufdset) || __get_user(h, ufdset+1)) - return -EFAULT; - ufdset += 2; - *fdset++ = h << 32 | l; - nr -= 2; - } - if (odd && __get_user(*fdset, ufdset)) - return -EFAULT; + return compat_get_bitmap(fdset, ufdset, nr); } else { /* Tricky, must clear full unsigned long in the - * kernel fdset at the end, this makes sure that + * kernel fdset at the end, ALIGN makes sure that * actually happens. */ - memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t)); + memset(fdset, 0, ALIGN(nr, BITS_PER_LONG)); + return 0; } - return 0; } static int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset, unsigned long *fdset) { - unsigned long odd; - nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS); - if (!ufdset) return 0; - - odd = nr & 1UL; - nr &= ~1UL; - while (nr) { - unsigned long h, l; - l = *fdset++; - h = l >> 32; - if (__put_user(l, ufdset) || __put_user(h, ufdset+1)) - return -EFAULT; - ufdset += 2; - nr -= 2; - } - if (odd && __put_user(*fdset, ufdset)) - return -EFAULT; - return 0; + return compat_put_bitmap(ufdset, fdset, nr); } |