linux-kernel - Re: [PATCH 5.4 0/2] Backport few dfs related fixes to cifs

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Date:   Wed, 7 Jun 2023 13:20:23 -0700
From:   "Bhatnagar, Rishabh" <risbhat@...zon.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     <sfrench@...ba.org>, <stable@...r.kernel.org>,
        <linux-cifs@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5.4 0/2] Backport few dfs related fixes to cifs


On 6/7/23 12:07 PM, Greg KH wrote:
> CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you can confirm the sender and know the content is safe.
>
>
>
> On Wed, Jun 07, 2023 at 06:53:11PM +0000, Rishabh Bhatnagar wrote:
>> Recently we have been seeing kernel panic in cifs_reconnect function
>> while accessing tgt_list. Looks like tgt_list is not initialized
>> correctly. There are fixes already present in 5.10 and later trees.
>> Backporting them to 5.4
>>
>>   CIFS VFS: \\172.30.1.14 cifs_reconnect: no target servers for DFS
>>   failover
>>   BUG: unable to handle page fault for address: fffffffffffffff8
>>   #PF: supervisor read access in kernel mode
>>   #PF: error_code(0x0000) - not-present page
>>   PGD 260e067 P4D 260e067 PUD 2610067 PMD 0
>>   Oops: 0000 [#1] SMP PTI
>>   RIP: 0010:cifs_reconnect+0x51d/0xef0 [cifs]
>>   RSP: 0018:ffffc90000693da0 EFLAGS: 00010282
>>   RAX: fffffffffffffff8 RBX: ffff8887fa63b800 RCX: fffffffffffffff8
>>   Call Trace:
>>   cifs_handle_standard+0x18d/0x1b0 [cifs]
>>   cifs_demultiplex_thread+0xa5c/0xc90 [cifs]
>>   kthread+0x113/0x130
>>
>> *** BLURB HERE ***
> No blurb?
>
> And this says 5.4, yet your patches say 5.10?
>
> Totally confused...
>
> greg k-h

These patches are applicable for 5.4. Will send another version with 
that fixed.
Apologies for the mess.