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[Qemu-devel] [PATCH v4 29/47] ivshmem: error on too many eventfd receive


From: marcandre . lureau
Subject: [Qemu-devel] [PATCH v4 29/47] ivshmem: error on too many eventfd received
Date: Thu, 24 Sep 2015 13:37:31 +0200

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 | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c
index aeb8414..3231a46 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 */
-- 
2.4.3




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