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[01/26] staging:batman-adv: only modify hna-table on active module

Message ID 1273177132-8792-2-git-send-email-andrew@lunn.ch (mailing list archive)
State Not Applicable, archived
Headers

Commit Message

Andrew Lunn May 6, 2010, 8:18 p.m. UTC 
  From: Linus Lüssing <linus.luessing@web.de>

If we haven't set the module to MODULE_ACTIVE state before (in general,
no interface has yet been added to batman-adv) then the hna table is not
initialised yet. If the kernel changes the mac address of the bat0
interface at this moment then an hna_local_add() called by interface_set_mac_addr()
then resulted in a null pointer derefernce. With this patch we are now
explicitly checking before if the state is MODULE_ACTIVE right now so
that we can assume having an initialised hna table.

Signed-off-by: Linus Lüssing <linus.luessing@web.de>
---
 drivers/staging/batman-adv/soft-interface.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/staging/batman-adv/soft-interface.c b/drivers/staging/batman-adv/soft-interface.c
index 0e2307f..a42b21f 100644
--- a/drivers/staging/batman-adv/soft-interface.c
+++ b/drivers/staging/batman-adv/soft-interface.c
@@ -152,9 +152,13 @@  int interface_set_mac_addr(struct net_device *dev, void *p)
 	if (!is_valid_ether_addr(addr->sa_data))
 		return -EADDRNOTAVAIL;
 
-	hna_local_remove(dev->dev_addr, "mac address changed");
+	/* only modify hna-table if it has been initialised before */
+	if (atomic_read(&module_state) == MODULE_ACTIVE) {
+		hna_local_remove(dev->dev_addr, "mac address changed");
+		hna_local_add(addr->sa_data);
+	}
+
 	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
-	hna_local_add(dev->dev_addr);
 
 	return 0;
 }