[TIPC] Fixed sk_buff panic caused by tipc_link_bundle_buf (REVISED)

The recent change to direct inspection of bundle buffer tailroom did not
account for the possiblity of unrequested tailroom added by skb_alloc(),
thereby allowing a bundle to be created that exceeds the current link MTU.
An additional check now ensures that bundling works correctly no matter
if the bundle buffer is smaller, larger, or equal to the link MTU.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Per Liden <per.liden@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/tipc/link.c b/net/tipc/link.c
index c6831c75cfa4..c10e18a49b96 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -998,6 +998,8 @@ static int link_bundle_buf(struct link *l_ptr,
                 return 0;
         if (skb_tailroom(bundler) < (pad + size))
                 return 0;
+        if (link_max_pkt(l_ptr) < (to_pos + size))
+                return 0;
 
         skb_put(bundler, pad + size);
         memcpy(bundler->data + to_pos, buf->data, size);