From: Sebastian Krahmer <krahmer@suse.de>
Date: Mon, 15 Sep 2014 16:40:07 +0000 (+0200)
Subject: ivshmem: Fix potential OOB r/w access
X-Git-Tag: v2.1.3~71
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=a95569d24f2462e1795a85aca17185ecd8856fc3;p=thirdparty%2Fqemu.git

ivshmem: Fix potential OOB r/w access

Fix OOB access via malformed incoming_posn parameters
and check that requested memory is actually alloc'ed.

Signed-off-by: Sebastian Krahmer <krahmer@suse.de>
[AF: Rebased, cleanups, avoid fd leak]
Cc: qemu-stable@nongnu.org
Signed-off-by: Andreas Färber <afaerber@suse.de>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

(cherry picked from commit 34bc07c5282a631c2663ae1ded0a186f46f64612)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---

diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c
index 02e3dd9b2f7..c3dc5c31795 100644
--- a/hw/misc/ivshmem.c
+++ b/hw/misc/ivshmem.c
@@ -29,6 +29,7 @@
 
 #include <sys/mman.h>
 #include <sys/types.h>
+#include <limits.h>
 
 #define PCI_VENDOR_ID_IVSHMEM   PCI_VENDOR_ID_REDHAT_QUMRANET
 #define PCI_DEVICE_ID_IVSHMEM   0x1110
@@ -406,14 +407,24 @@ static void close_guest_eventfds(IVShmemState *s, int posn)
 
 /* this function increase the dynamic storage need to store data about other
  * guests */
-static void increase_dynamic_storage(IVShmemState *s, int new_min_size) {
+static int increase_dynamic_storage(IVShmemState *s, int new_min_size)
+{
 
     int j, old_nb_alloc;
 
+    /* check for integer overflow */
+    if (new_min_size >= INT_MAX / sizeof(Peer) - 1 || new_min_size <= 0) {
+        return -1;
+    }
+
     old_nb_alloc = s->nb_peers;
 
-    while (new_min_size >= s->nb_peers)
-        s->nb_peers = s->nb_peers * 2;
+    if (new_min_size >= s->nb_peers) {
+        /* +1 because #new_min_size is used as last array index */
+        s->nb_peers = new_min_size + 1;
+    } else {
+        return 0;
+    }
 
     IVSHMEM_DPRINTF("bumping storage to %d guests\n", s->nb_peers);
     s->peers = g_realloc(s->peers, s->nb_peers * sizeof(Peer));
@@ -423,6 +434,8 @@ static void increase_dynamic_storage(IVShmemState *s, int new_min_size) {
         s->peers[j].eventfds = NULL;
         s->peers[j].nb_eventfds = 0;
     }
+
+    return 0;
 }
 
 static void ivshmem_read(void *opaque, const uint8_t *buf, int size)
@@ -465,7 +478,13 @@ static void ivshmem_read(void *opaque, const uint8_t *buf, int size)
 
     /* make sure we have enough space for this guest */
     if (incoming_posn >= s->nb_peers) {
-        increase_dynamic_storage(s, incoming_posn);
+        if (increase_dynamic_storage(s, incoming_posn) < 0) {
+            error_report("increase_dynamic_storage() failed");
+            if (tmp_fd != -1) {
+                close(tmp_fd);
+            }
+            return;
+        }
     }
 
     if (tmp_fd == -1) {