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Murat Sezgin | 28 Aug 21:01 2015

kernel panic in pppoe_release

Hi all,

We are using 3.4.103 kernel on our openwrt router platform. In the event of
interface down, we get kernel panic in the pppoe_release() function, because
the po->pppoe_dev comes to this function as NULL and dev_put() is called
without doing any NULL check.

I see that openwrt community has done an improvement for this issue with the
following commits in 3.18 and 4.0 kernels.

https://dev.openwrt.org/changeset/45653

I back ported these commits to our kernel and they increased the issue
occurrence frequency, but they didn't fix the issue completely. I ended up
that we need a NULL check in the pppoe_release() function as well. It seems
there is still a race between the pppoe_release() and the pppoe_flush_dev().
So, added the below change, but I would like to see whether this may have
side effects or not.

Can somebody please make comments on this?

 <at>  <at>  -589,7 +606,7  <at>  <at>  static int pppoe_release(struct socket *sock)

        po = pppox_sk(sk);

-       if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND | PPPOX_ZOMBIE)) {
+       if (po->pppoe_dev && sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND |
PPPOX_ZOMBIE)) {
                dev_put(po->pppoe_dev);
                po->pppoe_dev = NULL;
(Continue reading)

Vertical Limit | 25 Aug 11:09 2015
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HDLC frame timing

Hi all,

I am currently working on a system using pppd over a special radio
link. Would it be possible to insert a small time break (around 2ms)
between two consecutive HDLC frames? I could imagine compiling a
special customized pppd version for this purpose. I think there is no
pppd option for achieving this. Could someone help me by pointing me
to the right lines of codes or giving a better solution?

Many thanks,
Thomas
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Mark Singer | 20 Aug 09:12 2015

(unknown)


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Robert Grondahl | 19 Aug 13:47 2015
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Bless You

Good day,hoping you read this email and respond to me in good time.I do not intend to solicit for funds but 
your time and energy in using my own resources to assist the less privileged.I am medically confined at the
moment hence I request your indulgence.
I will give you a comprehensive brief once I hear from you.

Please forward your response to my private email address:
gudworks104 <at> yahoo.com

Thanks and reply.

Robert Grondahl
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christain147 | 19 Aug 15:01 2015
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Re:

Good day,hoping you read this email and respond to me in good time.I do not intend to solicit for funds but 
your time and energy in using my own resources to assist the less privileged.I am medically confined at the
moment hence I request your indulgence.
I will give you a comprehensive brief once I hear from you.

Please forward your response to my private email address:
gudworks104 <at> yahoo.com

Thanks and reply.

Robert Grondahl
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Brice Adams | 28 Jul 18:57 2015
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Please can I trust you?

My Dear Friend,

I am Mr. Brice Adams, staff and auditor of a Bank in Lome, Togo
Republic. I am the Account Officer to (Late Mr. Daniel I. Glade) whose
account is presently dormant, I advise you to keep this as a "top
secret" as I am still in service and intend to retire from service
after I conclude this deal with you. I have an important
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(6.5 Million Euros) left without a heir. If you can be of an
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fund. Please I got your email contact through internet email directory
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I will be humbly waiting your soonest response. Please contact direct
to my email address (brice2adams <at> yahoo.fr) for more information.

With Respect,
Mr. Brice Adams.
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(Continue reading)

adamwitkover56 | 9 Jul 11:38 2015
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Re: your protracted and stalled funds transfer from the U.K.

Attention Pls,

I am writing you with regards to your protracted and stalled funds transfer from the U.K. and would urge you
to accord this correspondence your full indulgence and attention, as the authenticity and difference
would be evident if you do so.

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Britain in all aspects of their work, your transfer file came to my attention just this morning, and I was
compelled to take special interest in it owing to its peculiar history of procedural inconsistencies.
Obviously all the persons you assigned to process your transfer have proved to be incompetent. Simply put
it that they have given room to some management of the Bank to try and smuggle your fund through a
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transparent and authoritative means where you will not be required to pay any unauthorized fees. You are
forbidden to preempt anyone of this contact and I await your response at your earliest convenience.

Thank you.

Sincerely,
Adam Witkover
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Sasnett_Karen | 1 Jul 13:53 2015

(unknown)


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Maninder Singh | 24 Jun 13:19 2015

[RFC][PATCH v2] ppp: remove NULL check before kfree

Removes NULL check before kfree
and using tabs in place of space.

and removing checkpatch warning:
labels should not be indented.

Signed-off-by: Maninder Singh <maninder1.s <at> samsung.com>
Reviewed-by: Vaneet narang <v.narang <at> samsung.com>
---
 drivers/net/ppp/ppp_mppe.c |   24 +++++++++++-------------
 1 file changed, 11 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ppp/ppp_mppe.c b/drivers/net/ppp/ppp_mppe.c
index 05005c6..339b50e 100644
--- a/drivers/net/ppp/ppp_mppe.c
+++ b/drivers/net/ppp/ppp_mppe.c
 <at>  <at>  -237,15 +237,14  <at>  <at>  static void *mppe_alloc(unsigned char *options, int optlen)

 	return (void *)state;

-	out_free:
-	    if (state->sha1_digest)
-		kfree(state->sha1_digest);
-	    if (state->sha1)
+out_free:
+	kfree(state->sha1_digest);
+	if (state->sha1)
 		crypto_free_hash(state->sha1);
-	    if (state->arc4)
+	if (state->arc4)
(Continue reading)

Maninder Singh | 24 Jun 13:05 2015

Re: [PATCH 1/1] ppp: remove NULL check before kfree


>No need of explicit NULL check before kfree,
>removing the same and little coding style changes.
>
>Signed-off-by: Maninder Singh <maninder1.s <at> samsung.com>
>Reviewed-by: Vaneet narang <v.narang <at> samsung.com>
>---
> drivers/net/ppp/ppp_mppe.c |   10 ++++------
> 1 file changed, 4 insertions(+), 6 deletions(-)
>
>diff --git a/drivers/net/ppp/ppp_mppe.c b/drivers/net/ppp/ppp_mppe.c
>index 05005c6..06f60b1 100644
>--- a/drivers/net/ppp/ppp_mppe.c
>+++ b/drivers/net/ppp/ppp_mppe.c
> <at>  <at>  -238,12 +238,11  <at>  <at>  static void *mppe_alloc(unsigned char *options, int optlen)
> 	return (void *)state;
> 
> 	out_free:
>-	    if (state->sha1_digest)
> 		kfree(state->sha1_digest);
> 	    if (state->sha1)
>-		crypto_free_hash(state->sha1);
>+			crypto_free_hash(state->sha1);
> 	    if (state->arc4)
>-		crypto_free_blkcipher(state->arc4);
>+			crypto_free_blkcipher(state->arc4);
> 	    kfree(state);
> 	out:
> 	return NULL;
> <at>  <at>  -256,12 +255,11  <at>  <at>  static void mppe_free(void *arg)
(Continue reading)


Gmane