From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Subject: [PATCH V3 0/2] [BUGFIX] virtio/console: Fix two bugs of splice_write To: Amit Shah , Greg Kroah-Hartman , linux-kernel@vger.kernel.org From: Yoshihiro YUNOMAE Cc: Arnd Bergmann , stable@vger.kernel.org, virtualization@lists.linux-foundation.org, Hidehiro Kawai , yrl.pp-manager.tt@hitachi.com, Masami Hiramatsu Date: Mon, 22 Jul 2013 13:00:43 +0900 Message-ID: <20130722040043.7531.78801.stgit@yunodevel> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: Hi, This patch set fixes two bugs of splice_write in the virtio-console driver. [BUG1] Although pipe->nrbufs is empty, the driver tries to do splice_write. => This induces oops in sg_init_table(). [BUG2] No lock for competition of splice_write. => This induces oops in splice_from_pipe_feed() by bug of any user application. These reports are written in each patch. Changes in V2: - Fix a locking problem for error Changes in V3: - Add Reviewed-by lines and stable@ line in sign-off area Thanks! --- Yoshihiro YUNOMAE (2): [BUGFIX] virtio/console: Quit from splice_write if pipe->nrbufs is 0 [BUGFIX] virtio/console: Add pipe_lock/unlock for splice_write drivers/char/virtio_console.c | 23 ++++++++++++++++++++--- 1 file changed, 20 insertions(+), 3 deletions(-) -- Yoshihiro YUNOMAE Software Platform Research Dept. Linux Technology Center Hitachi, Ltd., Yokohama Research Laboratory E-mail: yoshihiro.yunomae.ez@hitachi.com