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由 Pavel Shilovsky 提交于
commit ef68e831840c40c7d01b328b3c0f5d8c4796c232 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: NPavel Shilovsky <pshilov@microsoft.com> Reviewed-by: NRonnie Sahlberg <lsahlber@redhat.com> Signed-off-by: NSteve French <stfrench@microsoft.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
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