diff options
Diffstat (limited to 'drivers/of')
| -rw-r--r-- | drivers/of/address.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/of/address.c b/drivers/of/address.c index 7a07751428de..72e496f1e9b0 100644 --- a/drivers/of/address.c +++ b/drivers/of/address.c @@ -69,6 +69,14 @@ static u64 of_bus_default_map(u32 *addr, const __be32 *range, (unsigned long long)cp, (unsigned long long)s, (unsigned long long)da); + /* + * If the number of address cells is larger than 2 we assume the + * mapping doesn't specify a physical address. Rather, the address + * specifies an identifier that must match exactly. + */ + if (na > 2 && memcmp(range, addr, na * 4) != 0) + return OF_BAD_ADDR; + if (da < cp || da >= (cp + s)) return OF_BAD_ADDR; return da - cp; |