[PATCH V2 0/2] [BUGFIX] virtio/console: Fix two bugs of splice_write

From: Yoshihiro YUNOMAE
Date: Fri Jul 19 2013 - 05:16:04 EST


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

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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