[SPARC64]: Fix MD property lifetime bugs.
Property values cannot be referenced outside of
mdesc_grab()/mdesc_release() pairs. The only major
offender was the VIO bus layer, easily fixed.
Add some commentary to mdesc.h describing these rules.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc64/kernel/vio.c b/arch/sparc64/kernel/vio.c
index 64f0825..8b269aa 100644
--- a/arch/sparc64/kernel/vio.c
+++ b/arch/sparc64/kernel/vio.c
@@ -44,12 +44,11 @@
while (matches->type[0] || matches->compat[0]) {
int match = 1;
- if (matches->type[0]) {
- match &= type
- && !strcmp(matches->type, type);
- }
+ if (matches->type[0])
+ match &= !strcmp(matches->type, type);
+
if (matches->compat[0]) {
- match &= compat &&
+ match &= len &&
find_in_proplist(compat, matches->compat, len);
}
if (match)
@@ -205,15 +204,30 @@
const char *type, *compat;
struct device_node *dp;
struct vio_dev *vdev;
- int err, clen;
+ int err, tlen, clen;
- type = mdesc_get_property(hp, mp, "device-type", NULL);
+ type = mdesc_get_property(hp, mp, "device-type", &tlen);
if (!type) {
- type = mdesc_get_property(hp, mp, "name", NULL);
- if (!type)
+ type = mdesc_get_property(hp, mp, "name", &tlen);
+ if (!type) {
type = mdesc_node_name(hp, mp);
+ tlen = strlen(type) + 1;
+ }
}
+ if (tlen > VIO_MAX_TYPE_LEN) {
+ printk(KERN_ERR "VIO: Type string [%s] is too long.\n",
+ type);
+ return NULL;
+ }
+
compat = mdesc_get_property(hp, mp, "device-type", &clen);
+ if (!compat) {
+ clen = 0;
+ } else if (clen > VIO_MAX_COMPAT_LEN) {
+ printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n",
+ clen, type);
+ return NULL;
+ }
vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
if (!vdev) {
@@ -222,8 +236,11 @@
}
vdev->mp = mp;
- vdev->type = type;
- vdev->compat = compat;
+ memcpy(vdev->type, type, tlen);
+ if (compat)
+ memcpy(vdev->compat, compat, clen);
+ else
+ memset(vdev->compat, 0, sizeof(vdev->compat));
vdev->compat_len = clen;
vdev->channel_id = ~0UL;