gen_stats.c: Duplicate xstats buffer for later use

The gnet_stats_copy_app() function gets called, more often than not, with its
second argument a pointer to an automatic variable in the caller's stack.
Therefore, to avoid copying garbage afterwards when calling
gnet_stats_finish_copy(), this data is better copied to a dynamically allocated
memory that gets freed after use.

[xiyou.wangcong@gmail.com: remove a useless kfree()]

Signed-off-by: Ignacy Gawędzki <ignacy.gawedzki@green-communications.fr>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/gen_stats.c b/net/core/gen_stats.c
index 0c08062..1e2f46a 100644 (file)
--- a/net/core/gen_stats.c
+++ b/net/core/gen_stats.c
@@ -32,6 +32,9 @@ gnet_stats_copy(struct gnet_dump *d, int type, void *buf, int size)
        return 0;
 
 nla_put_failure:
+       kfree(d->xstats);
+       d->xstats = NULL;
+       d->xstats_len = 0;
        spin_unlock_bh(d->lock);
        return -1;
 }
@@ -305,7 +308,9 @@ int
 gnet_stats_copy_app(struct gnet_dump *d, void *st, int len)
 {
        if (d->compat_xstats) {
-               d->xstats = st;
+               d->xstats = kmemdup(st, len, GFP_ATOMIC);
+               if (!d->xstats)
+                       goto err_out;
                d->xstats_len = len;
        }
 
@@ -313,6 +318,11 @@ gnet_stats_copy_app(struct gnet_dump *d, void *st, int len)
                return gnet_stats_copy(d, TCA_STATS_APP, st, len);
 
        return 0;
+
+err_out:
+       d->xstats_len = 0;
+       spin_unlock_bh(d->lock);
+       return -1;
 }
 EXPORT_SYMBOL(gnet_stats_copy_app);
 
@@ -345,6 +355,9 @@ gnet_stats_finish_copy(struct gnet_dump *d)
                        return -1;
        }
 
+       kfree(d->xstats);
+       d->xstats = NULL;
+       d->xstats_len = 0;
        spin_unlock_bh(d->lock);
        return 0;
 }