Stanse found a locking problem in vhost_set_vring: several returns from VHOST_SET_VRING_KICK, VHOST_SET_VRING_CALL, VHOST_SET_VRING_ERR with the vq->mutex held. Fix these up.
Reported-by: Jiri Slaby <[email protected]> Signed-off-by: Michael S. Tsirkin <[email protected]> --- drivers/vhost/vhost.c | 18 ++++++++++++------ 1 files changed, 12 insertions(+), 6 deletions(-) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 7cd55e0..7bd7a1e 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -476,8 +476,10 @@ static long vhost_set_vring(struct vhost_dev *d, int ioctl, void __user *argp) if (r < 0) break; eventfp = f.fd == -1 ? NULL : eventfd_fget(f.fd); - if (IS_ERR(eventfp)) - return PTR_ERR(eventfp); + if (IS_ERR(eventfp)) { + r = PTR_ERR(eventfp); + break; + } if (eventfp != vq->kick) { pollstop = filep = vq->kick; pollstart = vq->kick = eventfp; @@ -489,8 +491,10 @@ static long vhost_set_vring(struct vhost_dev *d, int ioctl, void __user *argp) if (r < 0) break; eventfp = f.fd == -1 ? NULL : eventfd_fget(f.fd); - if (IS_ERR(eventfp)) - return PTR_ERR(eventfp); + if (IS_ERR(eventfp)) { + r = PTR_ERR(eventfp); + break; + } if (eventfp != vq->call) { filep = vq->call; ctx = vq->call_ctx; @@ -505,8 +509,10 @@ static long vhost_set_vring(struct vhost_dev *d, int ioctl, void __user *argp) if (r < 0) break; eventfp = f.fd == -1 ? NULL : eventfd_fget(f.fd); - if (IS_ERR(eventfp)) - return PTR_ERR(eventfp); + if (IS_ERR(eventfp)) { + r = PTR_ERR(eventfp); + break; + } if (eventfp != vq->error) { filep = vq->error; vq->error = eventfp; -- 1.7.0.18.g0d53a5 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
