2017-07-16 6:57 Ben Hutchings <[email protected]>:
>
> 3.16.46-rc1 review patch. If anyone has any objections, please let me know.
>
> ------------------
>
> From: Sachin Prabhu <[email protected]>
>
> commit 62a6cfddcc0a5313e7da3e8311ba16226fe0ac10 upstream.
>
> commit 4fcd1813e640 ("Fix reconnect to not defer smb3 session reconnect long
> after socket reconnect") added support for Negotiate requests to be initiated
> by echo calls.
>
> To avoid delays in calling echo after a reconnect, I added the patch
> introduced by the commit b8c600120fc8 ("Call echo service immediately after
> socket reconnect").
>
> This has however caused a regression with cifs shares which do not have
> support for echo calls to trigger Negotiate requests. On connections which
> need to call Negotiation, the echo calls trigger an error which triggers a
> reconnect which in turn triggers another echo call. This results in a loop
> which is only broken when an operation is performed on the cifs share. For an
> idle share, it can DOS a server.
>
> The patch uses the smb_operation can_echo() for cifs so that it is called
> only if connection has been already been setup.
>
> kernel bz: 194531
>
> Signed-off-by: Sachin Prabhu <[email protected]>
> Tested-by: Jonathan Liu <[email protected]>
> Acked-by: Pavel Shilovsky <[email protected]>
> Signed-off-by: Steve French <[email protected]>
> Signed-off-by: Ben Hutchings <[email protected]>
> ---
> fs/cifs/smb1ops.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
I have just posted a backport of commit b8c600120fc8 ("Call echo service
immediately after socket reconnect") for v3.16.x kernel to the stable mailing
list. Please consider merging it too.
Best regards,
Pavel Shilovsky
