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datapath: Reduce loop limit by one to 4.

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We currently allow five trips through the kernel datapath
before dropping the packet to protect the stack.  However, there
have been a few reports recently involving tunneling that this is
still too much.  Although it's not a complete solution, this reduces
the limit by one to balance safety in common situations with
flexibility.

Bug #15477

Reported-by: Paul Ingram <paul@nicira.com>
Reported-by: 謝秉融 <faithfulman@gmail.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>
Acked-by: Pravin B Shelar <pshelar@nicira.com>
This commit is contained in:
Jesse Gross
2013-03-12 12:36:03 -07:00
parent d0db8de278
commit 09dc041596
1 changed files with 1 additions and 1 deletions
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datapath/actions.c
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@@ -532,7 +532,7 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
/* We limit the number of times that we pass into execute_actions()
* to avoid blowing out the stack in the event that we have a loop. */
#define MAX_LOOPS 5
#define MAX_LOOPS 4
struct loop_counter {
u8 count; /* Count. */