[NET]: Fix potential stack overflow in net/core/utils.c

On High end systems (1024 or so cpus) this can potentially cause stack
overflow.  Fix the stack usage.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 3 deletions

diff --git a/net/core/utils.c b/net/core/utils.c
index 4f96f389243d..e31c90e05594 100644
--- a/net/core/utils.c
+++ b/net/core/utils.c
@@ -130,12 +130,13 @@ void __init net_random_init(void)
 static int net_random_reseed(void)
 {
         int i;
-        unsigned long seed[NR_CPUS];
+        unsigned long seed;
 
-        get_random_bytes(seed, sizeof(seed));
         for_each_possible_cpu(i) {
                 struct nrnd_state *state = &per_cpu(net_rand_state,i);
-                __net_srandom(state, seed[i]);
+
+                get_random_bytes(&seed, sizeof(seed));
+                __net_srandom(state, seed);
         }
         return 0;
 }