diff options
Diffstat (limited to 'runtime/addr-map.c')
| -rw-r--r-- | runtime/addr-map.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/runtime/addr-map.c b/runtime/addr-map.c index 8c0e84d8..a9aa8d88 100644 --- a/runtime/addr-map.c +++ b/runtime/addr-map.c @@ -110,6 +110,10 @@ lookup_bad_addr(unsigned long addr, size_t size) { struct addr_map_entry* result = 0; + /* Is this a valid memory access? */ + if (size == 0 || ULONG_MAX - addr < size - 1) + return 1; + #ifndef STP_PRIVILEGED /* Unprivileged users must not access kernel space memory. */ if (addr + size > TASK_SIZE) |