mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-21 14:37:57 +00:00
a1abf71827
1. Check for -EPROBE_DEFER
If it occurs we have to return immediately. Trying other properties
could result in another error and ignoring -EPROBE_DEFER which has a
special meaning.
2. Check for read result
Assuming property->read() success can result in NULL pointer
dereference. It happens e.g. for "mac-address" with NVMEM cell
containing invalid MAC.
3. Simplify code
Don't move cell reading & nvmem_cell_put() into a loop. Simplify loop
code.
Fixes: ecd81de7a5 ("ath79: add nvmem cell mac-address-ascii support")
Cc: Yousong Zhou <yszhou4tech@gmail.com>
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
112 lines
2.8 KiB
Diff
112 lines
2.8 KiB
Diff
From: Yousong Zhou <yszhou4tech@gmail.com>
|
|
Subject: [PATCH] ath79: add nvmem cell mac-address-ascii support
|
|
|
|
This is needed for devices with mac address stored in ascii format, e.g.
|
|
HiWiFi HC6361 to be ported in the following patch.
|
|
|
|
Submitted-by: Yousong Zhou <yszhou4tech@gmail.com>
|
|
---
|
|
net/ethernet/eth.c | 83 ++++++++++++------
|
|
1 files changed, 72 insertions(+), 11 deletions(-)
|
|
|
|
--- a/net/ethernet/eth.c
|
|
+++ b/net/ethernet/eth.c
|
|
@@ -539,6 +539,63 @@ int eth_platform_get_mac_address(struct
|
|
}
|
|
EXPORT_SYMBOL(eth_platform_get_mac_address);
|
|
|
|
+static void *nvmem_cell_get_mac_address(struct nvmem_cell *cell)
|
|
+{
|
|
+ size_t len;
|
|
+ void *mac;
|
|
+
|
|
+ mac = nvmem_cell_read(cell, &len);
|
|
+ if (IS_ERR(mac))
|
|
+ return mac;
|
|
+ if (len != ETH_ALEN) {
|
|
+ kfree(mac);
|
|
+ return ERR_PTR(-EINVAL);
|
|
+ }
|
|
+ return mac;
|
|
+}
|
|
+
|
|
+static void *nvmem_cell_get_mac_address_ascii(struct nvmem_cell *cell)
|
|
+{
|
|
+ size_t len;
|
|
+ int ret;
|
|
+ void *mac_ascii;
|
|
+ u8 *mac;
|
|
+
|
|
+ mac_ascii = nvmem_cell_read(cell, &len);
|
|
+ if (IS_ERR(mac_ascii))
|
|
+ return mac_ascii;
|
|
+ if (len != ETH_ALEN*2+5) {
|
|
+ kfree(mac_ascii);
|
|
+ return ERR_PTR(-EINVAL);
|
|
+ }
|
|
+ mac = kmalloc(ETH_ALEN, GFP_KERNEL);
|
|
+ if (!mac) {
|
|
+ kfree(mac_ascii);
|
|
+ return ERR_PTR(-ENOMEM);
|
|
+ }
|
|
+ ret = sscanf(mac_ascii, "%2hhx:%2hhx:%2hhx:%2hhx:%2hhx:%2hhx",
|
|
+ &mac[0], &mac[1], &mac[2],
|
|
+ &mac[3], &mac[4], &mac[5]);
|
|
+ kfree(mac_ascii);
|
|
+ if (ret == ETH_ALEN)
|
|
+ return mac;
|
|
+ kfree(mac);
|
|
+ return ERR_PTR(-EINVAL);
|
|
+}
|
|
+
|
|
+static struct nvmem_cell_mac_address_property {
|
|
+ char *name;
|
|
+ void *(*read)(struct nvmem_cell *);
|
|
+} nvmem_cell_mac_address_properties[] = {
|
|
+ {
|
|
+ .name = "mac-address",
|
|
+ .read = nvmem_cell_get_mac_address,
|
|
+ }, {
|
|
+ .name = "mac-address-ascii",
|
|
+ .read = nvmem_cell_get_mac_address_ascii,
|
|
+ },
|
|
+};
|
|
+
|
|
/**
|
|
* Obtain the MAC address from an nvmem cell named 'mac-address' associated
|
|
* with given device.
|
|
@@ -550,21 +607,28 @@ EXPORT_SYMBOL(eth_platform_get_mac_addre
|
|
*/
|
|
int nvmem_get_mac_address(struct device *dev, void *addrbuf)
|
|
{
|
|
+ struct nvmem_cell_mac_address_property *property;
|
|
struct nvmem_cell *cell;
|
|
const void *mac;
|
|
- size_t len;
|
|
+ int i;
|
|
+
|
|
+ for (i = 0; i < ARRAY_SIZE(nvmem_cell_mac_address_properties); i++) {
|
|
+ property = &nvmem_cell_mac_address_properties[i];
|
|
+ cell = nvmem_cell_get(dev, property->name);
|
|
+ /* For -EPROBE_DEFER don't try other properties. We'll get back to this one. */
|
|
+ if (!IS_ERR(cell) || PTR_ERR(cell) == -EPROBE_DEFER)
|
|
+ break;
|
|
+ }
|
|
|
|
- cell = nvmem_cell_get(dev, "mac-address");
|
|
if (IS_ERR(cell))
|
|
return PTR_ERR(cell);
|
|
|
|
- mac = nvmem_cell_read(cell, &len);
|
|
+ mac = property->read(cell);
|
|
nvmem_cell_put(cell);
|
|
-
|
|
if (IS_ERR(mac))
|
|
return PTR_ERR(mac);
|
|
|
|
- if (len != ETH_ALEN || !is_valid_ether_addr(mac)) {
|
|
+ if (!is_valid_ether_addr(mac)) {
|
|
kfree(mac);
|
|
return -EINVAL;
|
|
}
|