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| author | Keiichi KII <k-keiichi@bx.jp.nec.com> | 2008-02-15 02:01:58 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-02-15 02:01:58 -0800 |
| commit | 69c3683ca7fe066ecba9e8a0424c5abd258a5d58 (patch) | |
| tree | 885d2e9eca411c70d600623b2bfb9526304f1320 /drivers/net/netconsole.c | |
| parent | b5c15fc004ac83b7ad280acbe0fd4bbed7e2c8d4 (diff) | |
| download | linux-69c3683ca7fe066ecba9e8a0424c5abd258a5d58.tar.gz linux-69c3683ca7fe066ecba9e8a0424c5abd258a5d58.tar.bz2 linux-69c3683ca7fe066ecba9e8a0424c5abd258a5d58.zip | |
netconsole: avoid null pointer dereference at show_local_mac()
This patch avoids a null pointer dereference when we read local_mac
for netconsole in configfs and shows default local mac address
value.
A null pointer dereference occurs when we call show_local_mac() via
local_mac entry in configfs before we setup the content of netpoll
using netpoll_setup().
Signed-off-by: Keiichi KII <k-keiichi@bx.jp.nec.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/netconsole.c')
| -rw-r--r-- | drivers/net/netconsole.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c index 31e047dd7bb3..501e451be911 100644 --- a/drivers/net/netconsole.c +++ b/drivers/net/netconsole.c @@ -309,8 +309,8 @@ static ssize_t show_local_mac(struct netconsole_target *nt, char *buf) struct net_device *dev = nt->np.dev; DECLARE_MAC_BUF(mac); - return snprintf(buf, PAGE_SIZE, "%s\n", - print_mac(mac, dev->dev_addr)); + return snprintf(buf, PAGE_SIZE, "%s\n", dev ? + print_mac(mac, dev->dev_addr) : "ff:ff:ff:ff:ff:ff"); } static ssize_t show_remote_mac(struct netconsole_target *nt, char *buf) |