diff options
| -rw-r--r-- | boot/boot.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/boot/boot.c b/boot/boot.c index eb78a1c6..978d8943 100644 --- a/boot/boot.c +++ b/boot/boot.c @@ -1458,10 +1458,11 @@ S_io_read (mach_port_t object, ioctl (0, FIONREAD, &avail); if (avail) { + data_t orig_data = *data; if (amount > *datalen) *data = mmap (0, amount, PROT_READ|PROT_WRITE, MAP_ANON, 0, 0); *datalen = read (0, *data, amount); - if (*datalen == -1) + if (*datalen == -1 && *data != orig_data) munmap (*data, amount); unlock_readlock (); return *datalen == -1 ? errno : 0; |