Re: memory leakage in ncm_wrap_ntb() in USB ncm mode with kernel 5.15

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hello:
       In embedded devices with relatively small memory, if the transfer speed of ncm is fast and other programs occupy CPU memory, it is likely that the return value ncm ->skd_tx_data of alloc_skb() is NULL, and the code is likely to enter err. If skb2 is not processed in err, it will cause memory leakage.

Thank you.

nanfengwq@xxxxxxxx
 
From: gregkh
Date: 2024-05-19 22:37
To: nanfengwq@xxxxxxxx
CC: balbi; linux-usb; linux-kernel
Subject: Re: memory leakage in ncm_wrap_ntb() in USB ncm mode with kernel 5.15
On Sun, May 19, 2024 at 10:23:10PM +0800, nanfengwq@xxxxxxxx wrote:
> Hello:
> I have discovered a risk of memory leakage in ncm_wrap_ntb() under USB ncm mode in kernel 5.15, and I have fixed it.
> Please help me review it.
>
> If this modification is effective, it can also be integrated into other kernel versions, such as kernel 4.14, and so on.
>
> The logic of a memory leak is as follows:
>
> If the return value skb2 of  package_for_tx() is not NULL, and the return value ncm->skb_tx_data of alloc_skb() is NULL, then the code will go to err, where there is no processing of skb2, resulting in a memory leak in skb2.
>
>
> Thank you.
>
>
>
>
 
 
Hi,
 
This is the friendly patch-bot of Greg Kroah-Hartman.  You have sent him
a patch that has triggered this response.  He used to manually respond
to these common problems, but in order to save his sanity (he kept
writing the same thing over and over, yet to different people), I was
created.  Hopefully you will not take offence and will fix the problem
in your patch and resubmit it so that it can be accepted into the Linux
kernel tree.
 
You are receiving this message because of the following common error(s)
as indicated below:
 
- Your patch did not apply to any known trees that Greg is in control
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  the linux-next tree, which is where all of the development for the
  next version of the kernel is at.  Please refresh your patch against
  the linux-next tree, or even better yet, the development tree
  specified in the MAINTAINERS file for the subsystem you are submitting
  a patch for, and resend it.
 
- You did not specify a description of why the patch is needed, or
  possibly, any description at all, in the email body.  Please read the
  section entitled "The canonical patch format" in the kernel file,
  Documentation/process/submitting-patches.rst for what is needed in
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- You did not write a descriptive Subject: for the patch, allowing Greg,
  and everyone else, to know what this patch is all about.  Please read
  the section entitled "The canonical patch format" in the kernel file,
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- It looks like you did not use your "real" name for the patch on either
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If you wish to discuss this problem further, or you have questions about
how to resolve this issue, please feel free to respond to this email and
Greg will reply once he has dug out from the pending patches received
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thanks,
 
greg k-h's patch email bot
 

Attachment: 0001-USB-NCM-mode-There-is-a-memory-leak.patch
Description: Binary data


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