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authorNikolay Aleksandrov <nikolay@redhat.com>2013-10-24 12:09:24 +0200
committerDavid S. Miller <davem@davemloft.net>2013-10-25 19:26:58 -0400
commitc7c6effdeffcafd792b9f880ad52e48689eea4ad (patch)
treeb80c4d38acd41a1d7b3afcbc5ba5a2f1958d401e /drivers/net/netconsole.c
parent45e526e80e6fdc796d3bc05716d5c930a427df4d (diff)
netconsole: fix multiple race conditions
In every netconsole option that can be set through configfs there's a race when checking for nt->enabled since it can be modified at the same time. Probably the most damage can be done by store_enabled when racing with another instance of itself. Fix all the races with one stone by moving the mutex lock around the ->store call for all options. Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/netconsole.c')
-rw-r--r--drivers/net/netconsole.c10
1 files changed, 3 insertions, 7 deletions
diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index 1505dcb950fa..c9a15925a1f7 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -325,9 +325,7 @@ static ssize_t store_enabled(struct netconsole_target *nt,
return -EINVAL;
}
- mutex_lock(&nt->mutex);
if (enabled) { /* 1 */
-
/*
* Skip netpoll_parse_options() -- all the attributes are
* already configured via configfs. Just print them out.
@@ -335,13 +333,10 @@ static ssize_t store_enabled(struct netconsole_target *nt,
netpoll_print_options(&nt->np);
err = netpoll_setup(&nt->np);
- if (err) {
- mutex_unlock(&nt->mutex);
+ if (err)
return err;
- }
printk(KERN_INFO "netconsole: network logging started\n");
-
} else { /* 0 */
/* We need to disable the netconsole before cleaning it up
* otherwise we might end up in write_msg() with
@@ -354,7 +349,6 @@ static ssize_t store_enabled(struct netconsole_target *nt,
}
nt->enabled = enabled;
- mutex_unlock(&nt->mutex);
return strnlen(buf, count);
}
@@ -571,8 +565,10 @@ static ssize_t netconsole_target_attr_store(struct config_item *item,
struct netconsole_target_attr *na =
container_of(attr, struct netconsole_target_attr, attr);
+ mutex_lock(&nt->mutex);
if (na->store)
ret = na->store(nt, buf, count);
+ mutex_unlock(&nt->mutex);
return ret;
}