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gentoo/app-emulation/qemu/files/qemu-2.5.0-rng-stack-corrup...

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From 9f14b0add1dcdbfa2ee61051d068211fb0a1fcc9 Mon Sep 17 00:00:00 2001
From: Ladi Prosek <lprosek@redhat.com>
Date: Thu, 3 Mar 2016 09:37:17 +0100
Subject: [PATCH] rng: move request queue cleanup from RngEgd to RngBackend
RngBackend is now in charge of cleaning up the linked list on
instance finalization. It also exposes a function to finalize
individual RngRequest instances, called by its child classes.
Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Message-Id: <1456994238-9585-4-git-send-email-lprosek@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
---
backends/rng-egd.c | 25 +------------------------
backends/rng.c | 32 ++++++++++++++++++++++++++++++++
include/sysemu/rng.h | 12 ++++++++++++
3 files changed, 45 insertions(+), 24 deletions(-)
diff --git a/backends/rng-egd.c b/backends/rng-egd.c
index b061362..8f2bd16 100644
--- a/backends/rng-egd.c
+++ b/backends/rng-egd.c
@@ -58,12 +58,6 @@ static void rng_egd_request_entropy(RngBackend *b, size_t size,
s->parent.requests = g_slist_append(s->parent.requests, req);
}
-static void rng_egd_free_request(RngRequest *req)
-{
- g_free(req->data);
- g_free(req);
-}
-
static int rng_egd_chr_can_read(void *opaque)
{
RngEgd *s = RNG_EGD(opaque);
@@ -93,28 +87,13 @@ static void rng_egd_chr_read(void *opaque, const uint8_t *buf, int size)
size -= len;
if (req->offset == req->size) {
- s->parent.requests = g_slist_remove_link(s->parent.requests,
- s->parent.requests);
-
req->receive_entropy(req->opaque, req->data, req->size);
- rng_egd_free_request(req);
+ rng_backend_finalize_request(&s->parent, req);
}
}
}
-static void rng_egd_free_requests(RngEgd *s)
-{
- GSList *i;
-
- for (i = s->parent.requests; i; i = i->next) {
- rng_egd_free_request(i->data);
- }
-
- g_slist_free(s->parent.requests);
- s->parent.requests = NULL;
-}
-
static void rng_egd_opened(RngBackend *b, Error **errp)
{
RngEgd *s = RNG_EGD(b);
@@ -183,8 +162,6 @@ static void rng_egd_finalize(Object *obj)
}
g_free(s->chr_name);
-
- rng_egd_free_requests(s);
}
static void rng_egd_class_init(ObjectClass *klass, void *data)
diff --git a/backends/rng.c b/backends/rng.c
index 2f2f3ee..014cb9d 100644
--- a/backends/rng.c
+++ b/backends/rng.c
@@ -64,6 +64,30 @@ static void rng_backend_prop_set_opened(Object *obj, bool value, Error **errp)
s->opened = true;
}
+static void rng_backend_free_request(RngRequest *req)
+{
+ g_free(req->data);
+ g_free(req);
+}
+
+static void rng_backend_free_requests(RngBackend *s)
+{
+ GSList *i;
+
+ for (i = s->requests; i; i = i->next) {
+ rng_backend_free_request(i->data);
+ }
+
+ g_slist_free(s->requests);
+ s->requests = NULL;
+}
+
+void rng_backend_finalize_request(RngBackend *s, RngRequest *req)
+{
+ s->requests = g_slist_remove(s->requests, req);
+ rng_backend_free_request(req);
+}
+
static void rng_backend_init(Object *obj)
{
object_property_add_bool(obj, "opened",
@@ -72,6 +96,13 @@ static void rng_backend_init(Object *obj)
NULL);
}
+static void rng_backend_finalize(Object *obj)
+{
+ RngBackend *s = RNG_BACKEND(obj);
+
+ rng_backend_free_requests(s);
+}
+
static void rng_backend_class_init(ObjectClass *oc, void *data)
{
UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
@@ -84,6 +115,7 @@ static const TypeInfo rng_backend_info = {
.parent = TYPE_OBJECT,
.instance_size = sizeof(RngBackend),
.instance_init = rng_backend_init,
+ .instance_finalize = rng_backend_finalize,
.class_size = sizeof(RngBackendClass),
.class_init = rng_backend_class_init,
.abstract = true,
diff --git a/include/sysemu/rng.h b/include/sysemu/rng.h
index c744d82..08a2eda 100644
--- a/include/sysemu/rng.h
+++ b/include/sysemu/rng.h
@@ -78,4 +79,15 @@ struct RngBackend
void rng_backend_request_entropy(RngBackend *s, size_t size,
EntropyReceiveFunc *receive_entropy,
void *opaque);
+
+/**
+ * rng_backend_free_request:
+ * @s: the backend that created the request
+ * @req: the request to finalize
+ *
+ * Used by child rng backend classes to finalize requests once they've been
+ * processed. The request is removed from the list of active requests and
+ * deleted.
+ */
+void rng_backend_finalize_request(RngBackend *s, RngRequest *req);
#endif
--
2.7.4