diff options
Diffstat (limited to 'libdiskfs/rdwr-internal.c')
| -rw-r--r-- | libdiskfs/rdwr-internal.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/libdiskfs/rdwr-internal.c b/libdiskfs/rdwr-internal.c index 18a4ae1e..0d405517 100644 --- a/libdiskfs/rdwr-internal.c +++ b/libdiskfs/rdwr-internal.c @@ -58,7 +58,12 @@ _diskfs_rdwr_internal (struct node *np, if (memobj == MACH_PORT_NULL) return errno; - err = pager_memcpy (diskfs_get_filemap_pager_struct (np), memobj, + /* pager_memcpy inherently uses vm_offset_t, which may be smaller than off_t. */ + if (sizeof(off_t) > sizeof(vm_offset_t) && + offset + *amt > ((off_t) 1) << (sizeof(vm_offset_t) * 8)) + err = EFBIG; + else + err = pager_memcpy (diskfs_get_filemap_pager_struct (np), memobj, offset, data, amt, prot); if (!diskfs_check_readonly () && !notime) |