Subject: Re: [PATCH] Fix infinite retry loop in IP-Config

From: Benjamin ZORES <[email-masked]>
Date: Wed, 28 Jan 2009 13:08:15 +0100

Jarek Poplawski a écrit :
> On 28-01-2009 10:07, Benjamin ZORES wrote:
>   
>> Hi,
>>
>> The attached patch fixes some bug with ip-config max retry number.
>> In ip_auto_config(), kernel tries to retrieve IP configuration forever
>> in case of NFS root and some specific amount of time otherwise.
>>
>> The problem is that, in case of error, the code jump to the try_try_again
>> goto statement, that reassigns the retry number counter, which obviously
>> leads to an infinite loop if IP config fails.
>>
>> The attached patch corrects this behavior.
>> Hope one can push it to mainstream kernel tree.
>>
>> Ben
>>
>> diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
>> index 42a0f3d..4911b81 100644
>> --- a/net/ipv4/ipconfig.c
>> +++ b/net/ipv4/ipconfig.c
>> @@ -1268,6 +1268,7 @@ __be32 __init root_nfs_parse_addr(char *name)
>>  static int __init ip_auto_config(void)
>>  {
>>  	__be32 addr;
>> +	 int retries = CONF_OPEN_RETRIES;
>>     
>  
> Doesn't it need "#ifdef IPCONFIG_DYNAMIC" to prevent a compiler
> warning? I guess you could add a "Signed-off-by:" line BTW.
>   
You're perfectly right about this.
Attached an updated version of the patch.

Ben
commit 4f9928e4ed6aae2a4c2f2216cab1c16e38631a88
Author: Benjamin Zores <[email-masked]>
Signed-off-by: Benjamin Zores <[email-masked]>
Date:   Wed Jan 28 13:03:07 2009 +0100

    fix infinite retry loop in IP-Config

diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
index 42a0f3d..5fad34d 100644
--- a/net/ipv4/ipconfig.c
+++ b/net/ipv4/ipconfig.c
@@ -1268,6 +1268,9 @@ __be32 __init root_nfs_parse_addr(char *name)
 static int __init ip_auto_config(void)
 {
        __be32 addr;
+#ifdef IPCONFIG_DYNAMIC
+        int retries = CONF_OPEN_RETRIES;
+#endif
 
 #ifdef CONFIG_PROC_FS
        proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
@@ -1305,8 +1308,6 @@ static int __init ip_auto_config(void)
            ic_first_dev->next) {
 #ifdef IPCONFIG_DYNAMIC
 
-               int retries = CONF_OPEN_RETRIES;
-
                if (ic_dynamic() < 0) {
                        ic_close_devs();