diff mbox

[v5,29/48] ivshmem: error on too many eventfd received

Message ID 1443812991-17356-30-git-send-email-marcandre.lureau@redhat.com
State New
Headers show

Commit Message

Marc-André Lureau Oct. 2, 2015, 7:09 p.m. UTC 
From: Marc-André Lureau <marcandre.lureau@redhat.com>

The number of eventfd that can be handled per peer is limited by the
number of vectors. Return an error when receiving too many of them.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Claudio Fontana <claudio.fontana@huawei.com>
---
 hw/misc/ivshmem.c | 8 ++++++++
 1 file changed, 8 insertions(+)
diff mbox

Patch

diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c
index 0e31d1d..50af4c7 100644
--- a/hw/misc/ivshmem.c
+++ b/hw/misc/ivshmem.c
@@ -571,6 +571,14 @@  static void ivshmem_read(void *opaque, const uint8_t *buf, int size)
     /* each peer has an associated array of eventfds, and we keep
      * track of how many eventfds received so far */
     /* get a new eventfd: */
+    /* get a new eventfd */
+    if (peer->nb_eventfds >= s->vectors) {
+        error_report("Too many eventfd received, device has %d vectors",
+                     s->vectors);
+        close(incoming_fd);
+        return;
+    }
+
     new_eventfd = peer->nb_eventfds++;
 
     /* this is an eventfd for a particular peer VM */