[PATCH V3 0/2] [BUGFIX] virtio/console: Fix two bugs of splice_write

[Yoshihiro YUNOMAE]

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@xxxxxxxxxxx
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