[Qemu-devel] [PATCH v3 29/46] ivshmem: error on too many eventfd received

[marcandre . lureau]

From: Marc-André Lureau <address@hidden>

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 <address@hidden>
---
 hw/misc/ivshmem.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c
index b9c78cd..63e4c4f 100644
--- a/hw/misc/ivshmem.c
+++ b/hw/misc/ivshmem.c
@@ -569,6 +569,13 @@ static void ivshmem_read(void *opaque, const uint8_t *buf, 
int size)
     }
 
     /* 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;
+    }
+
     nth_eventfd = peer->nb_eventfds++;
 
     /* this is an eventfd for a particular peer VM */
-- 
2.4.3