CIFS: Do not reconnect TCP session in add_credits()

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commit ef68e83184 upstream.

When executing add_credits() we currently call cifs_reconnect()
if the number of credits is zero and there are no requests in
flight. In this case we may call cifs_reconnect() recursively
twice and cause memory corruption given the following sequence
of functions:

mid1.callback() -> add_credits() -> cifs_reconnect() ->
-> mid2.callback() -> add_credits() -> cifs_reconnect().

Fix this by avoiding to call cifs_reconnect() in add_credits()
and checking for zero credits in the demultiplex thread.

Cc: <stable@vger.kernel.org>
Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Pavel Shilovsky 2019-01-18 17:25:36 -08:00 • committed by Greg Kroah-Hartman

parent 207dea8d83

commit 6cd821848b

2 changed files with 46 additions and 7 deletions

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21

fs/cifs/connect.c

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32

fs/cifs/smb2ops.c

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