linux-kernel - RE: [PATCH v3] usb: gadget: f_fs: don't free buffer prematurely

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Date:   Fri, 22 Mar 2019 06:12:11 +0000
From:   "Yang, Fei" <fei.yang@...el.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     "balbi@...nel.org" <balbi@...nel.org>,
        "andrzej.p@...labora.com" <andrzej.p@...labora.com>,
        "plr.vincent@...il.com" <plr.vincent@...il.com>,
        "Shen, JingX" <jingx.shen@...el.com>,
        "john.stultz@...aro.org" <john.stultz@...aro.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v3] usb: gadget: f_fs: don't free buffer prematurely

>> The following kernel panic happens due to the io_data buffer gets 
>> deallocated before the async io is completed. Add a check for the case 
>> where io_data buffer should be deallocated by ffs_user_copy_worker.
>> 
>> [   41.663334] BUG: unable to handle kernel NULL pointer dereference at 0000000000000048
>> 
>> Fixes: 772a7a724f6 ("usb: gadget: f_fs: Allow scatter-gather buffers")
>> Signed-off-by: Fei Yang <fei.yang@...el.com>
>> Reviewed-by: Manu Gautam <mgautam@...eaurora.org>
>> Tested-by: John Stultz <john.stultz@...aro.org>
>> ---
>> v2: add tag: "Fixes: 772a7a724f6 ......", Reviewed-by and Tested-by.
>> v3: check data for NULL instead of "ret == -EIOCBQUEUED", which would be safer
>>     and keep the original logic intact.
> 
> If it "fixes" a problem in 5.0, we should add a:
> 	Cc: stable <stable@...r.kernel.org>
> to it as well.
Sent [PATCH v4] with Cc: stable

> thanks,
> 
> greg k-h