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authorMarc-André Lureau <marcandre.lureau@redhat.com>2017-05-03 20:54:12 +0400
committerMichael S. Tsirkin <mst@redhat.com>2017-05-10 22:04:23 +0300
commit640601c7cb1b6b41d3e1a435b986266c2b71e9bc (patch)
treed69caf1951e0a50139db7c6b5397ca1af1cfe486 /contrib/libvhost-user/libvhost-user.h
parent60cd11024f41cc73175e651a2dfe09a3cade56bb (diff)
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libvhost-user: fix crash when rings aren't ready
Calling libvhost-user functions like vu_queue_get_avail_bytes() when the queue doesn't yet have addresses will result in the crashes like the following: Program received signal SIGSEGV, Segmentation fault. 0x000055c414112ce4 in vring_avail_idx (vq=0x55c41582fd68, vq=0x55c41582fd68) at /home/dgilbert/git/qemu/contrib/libvhost-user/libvhost-user.c:940 940 vq->shadow_avail_idx = vq->vring.avail->idx; (gdb) p vq $1 = (VuVirtq *) 0x55c41582fd68 (gdb) p vq->vring $2 = {num = 0, desc = 0x0, avail = 0x0, used = 0x0, log_guest_addr = 0, flags = 0} at /home/dgilbert/git/qemu/contrib/libvhost-user/libvhost-user.c:940 No locals. at /home/dgilbert/git/qemu/contrib/libvhost-user/libvhost-user.c:960 num_heads = <optimized out> out_bytes=out_bytes@entry=0x7fffd035d7c4, max_in_bytes=max_in_bytes@entry=0, max_out_bytes=max_out_bytes@entry=0) at /home/dgilbert/git/qemu/contrib/libvhost-user/libvhost-user.c:1034 Add a pre-condition checks on vring.avail before accessing it. Fix documentation and return type of vu_queue_empty() while at it. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Tested-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'contrib/libvhost-user/libvhost-user.h')
-rw-r--r--contrib/libvhost-user/libvhost-user.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/contrib/libvhost-user/libvhost-user.h b/contrib/libvhost-user/libvhost-user.h
index 156b50e..af02a31 100644
--- a/contrib/libvhost-user/libvhost-user.h
+++ b/contrib/libvhost-user/libvhost-user.h
@@ -327,13 +327,13 @@ void vu_queue_set_notification(VuDev *dev, VuVirtq *vq, int enable);
bool vu_queue_enabled(VuDev *dev, VuVirtq *vq);
/**
- * vu_queue_enabled:
+ * vu_queue_empty:
* @dev: a VuDev context
* @vq: a VuVirtq queue
*
- * Returns: whether the queue is empty.
+ * Returns: true if the queue is empty or not ready.
*/
-int vu_queue_empty(VuDev *dev, VuVirtq *vq);
+bool vu_queue_empty(VuDev *dev, VuVirtq *vq);
/**
* vu_queue_notify: