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>
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b5c15fc004
Коммит
69c3683ca7
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@ -309,8 +309,8 @@ static ssize_t show_local_mac(struct netconsole_target *nt, char *buf)
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struct net_device *dev = nt->np.dev;
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DECLARE_MAC_BUF(mac);
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return snprintf(buf, PAGE_SIZE, "%s\n",
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print_mac(mac, dev->dev_addr));
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return snprintf(buf, PAGE_SIZE, "%s\n", dev ?
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print_mac(mac, dev->dev_addr) : "ff:ff:ff:ff:ff:ff");
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}
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static ssize_t show_remote_mac(struct netconsole_target *nt, char *buf)
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