backport various fixes for gluster, qxl and vnc

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

debian/patches/extra/0018-block-gluster-correctly-set-max_pdiscard-which-is-in.patch

@@ -0,0 +1,38 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Fabian Ebner <f.ebner@proxmox.com>
+Date: Fri, 6 May 2022 14:38:35 +0200
+Subject: [PATCH] block/gluster: correctly set max_pdiscard which is int64_t
+
+Previously, max_pdiscard would be zero in the following assertion:
+qemu-system-x86_64: ../block/io.c:3166: bdrv_co_pdiscard: Assertion
+`max_pdiscard >= bs->bl.request_alignment' failed.
+
+Fixes: 0c8022876f ("block: use int64_t instead of int in driver discard handlers")
+Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>
+Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
+---
+ block/gluster.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/block/gluster.c b/block/gluster.c
+index 398976bc66..592e71b22a 100644
+--- a/block/gluster.c
++++ b/block/gluster.c
+@@ -891,7 +891,7 @@ out:
+ static void qemu_gluster_refresh_limits(BlockDriverState *bs, Error **errp)
+ {
+     bs->bl.max_transfer = GLUSTER_MAX_TRANSFER;
+-    bs->bl.max_pdiscard = SIZE_MAX;
++    bs->bl.max_pdiscard = INT64_MAX;
+ }
+ 
+ static int qemu_gluster_reopen_prepare(BDRVReopenState *state,
+@@ -1304,7 +1304,7 @@ static coroutine_fn int qemu_gluster_co_pdiscard(BlockDriverState *bs,
+     GlusterAIOCB acb;
+     BDRVGlusterState *s = bs->opaque;
+ 
+-    assert(bytes <= SIZE_MAX); /* rely on max_pdiscard */
++    assert(bytes <= INT64_MAX); /* rely on max_pdiscard */
+ 
+     acb.size = 0;
+     acb.ret = 0;

debian/patches/extra/0019-ui-vnc.c-Fixed-a-deadlock-bug.patch

@@ -0,0 +1,72 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Rao Lei <lei.rao@intel.com>
+Date: Fri, 6 May 2022 14:38:36 +0200
+Subject: [PATCH] ui/vnc.c: Fixed a deadlock bug.
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+The GDB statck is as follows:
+(gdb) bt
+0  __lll_lock_wait (futex=futex@entry=0x56211df20360, private=0) at lowlevellock.c:52
+1  0x00007f263caf20a3 in __GI___pthread_mutex_lock (mutex=0x56211df20360) at ../nptl/pthread_mutex_lock.c:80
+2  0x000056211a757364 in qemu_mutex_lock_impl (mutex=0x56211df20360, file=0x56211a804857 "../ui/vnc-jobs.h", line=60)
+    at ../util/qemu-thread-posix.c:80
+3  0x000056211a0ef8c7 in vnc_lock_output (vs=0x56211df14200) at ../ui/vnc-jobs.h:60
+4  0x000056211a0efcb7 in vnc_clipboard_send (vs=0x56211df14200, count=1, dwords=0x7ffdf1701338) at ../ui/vnc-clipboard.c:138
+5  0x000056211a0f0129 in vnc_clipboard_notify (notifier=0x56211df244c8, data=0x56211dd1bbf0) at ../ui/vnc-clipboard.c:209
+6  0x000056211a75dde8 in notifier_list_notify (list=0x56211afa17d0 <clipboard_notifiers>, data=0x56211dd1bbf0) at ../util/notify.c:39
+7  0x000056211a0bf0e6 in qemu_clipboard_update (info=0x56211dd1bbf0) at ../ui/clipboard.c:50
+8  0x000056211a0bf05d in qemu_clipboard_peer_release (peer=0x56211df244c0, selection=QEMU_CLIPBOARD_SELECTION_CLIPBOARD)
+    at ../ui/clipboard.c:41
+9  0x000056211a0bef9b in qemu_clipboard_peer_unregister (peer=0x56211df244c0) at ../ui/clipboard.c:19
+10 0x000056211a0d45f3 in vnc_disconnect_finish (vs=0x56211df14200) at ../ui/vnc.c:1358
+11 0x000056211a0d4c9d in vnc_client_read (vs=0x56211df14200) at ../ui/vnc.c:1611
+12 0x000056211a0d4df8 in vnc_client_io (ioc=0x56211ce70690, condition=G_IO_IN, opaque=0x56211df14200) at ../ui/vnc.c:1649
+13 0x000056211a5b976c in qio_channel_fd_source_dispatch
+    (source=0x56211ce50a00, callback=0x56211a0d4d71 <vnc_client_io>, user_data=0x56211df14200) at ../io/channel-watch.c:84
+14 0x00007f263ccede8e in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
+15 0x000056211a77d4a1 in glib_pollfds_poll () at ../util/main-loop.c:232
+16 0x000056211a77d51f in os_host_main_loop_wait (timeout=958545) at ../util/main-loop.c:255
+17 0x000056211a77d630 in main_loop_wait (nonblocking=0) at ../util/main-loop.c:531
+18 0x000056211a45bc8e in qemu_main_loop () at ../softmmu/runstate.c:726
+19 0x000056211a0b45fa in main (argc=69, argv=0x7ffdf1701778, envp=0x7ffdf17019a8) at ../softmmu/main.c:50
+
+From the call trace, we can see it is a deadlock bug.
+vnc_disconnect_finish will acquire the output_mutex.
+But, the output_mutex will be acquired again in vnc_clipboard_send.
+Repeated locking will cause deadlock. So, I move
+qemu_clipboard_peer_unregister() behind vnc_unlock_output();
+
+Fixes: 0bf41cab93e ("ui/vnc: clipboard support")
+Signed-off-by: Lei Rao <lei.rao@intel.com>
+Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
+Message-Id: <20220105020808.597325-1-lei.rao@intel.com>
+Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
+(cherry-picked from commit 1dbbe6f172810026c51dc84ed927a3cc23017949)
+[FE: trivial backport for 6.2]
+Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>
+Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
+---
+ ui/vnc.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/ui/vnc.c b/ui/vnc.c
+index af02522e84..b253e85c65 100644
+--- a/ui/vnc.c
++++ b/ui/vnc.c
+@@ -1354,12 +1354,12 @@ void vnc_disconnect_finish(VncState *vs)
+         /* last client gone */
+         vnc_update_server_surface(vs->vd);
+     }
++    vnc_unlock_output(vs);
++
+     if (vs->cbpeer.update.notify) {
+         qemu_clipboard_peer_unregister(&vs->cbpeer);
+     }
+ 
+-    vnc_unlock_output(vs);
+-
+     qemu_mutex_destroy(&vs->output_mutex);
+     if (vs->bh != NULL) {
+         qemu_bh_delete(vs->bh);

debian/patches/extra/0020-display-qxl-render-fix-race-condition-in-qxl_cursor-.patch

@@ -0,0 +1,37 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Mauro Matteo Cascella <mcascell@redhat.com>
+Date: Thu, 7 Apr 2022 10:11:06 +0200
+Subject: [PATCH] display/qxl-render: fix race condition in qxl_cursor
+ (CVE-2021-4207)
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Avoid fetching 'width' and 'height' a second time to prevent possible
+race condition. Refer to security advisory
+https://starlabs.sg/advisories/22-4207/ for more information.
+
+Fixes: CVE-2021-4207
+Signed-off-by: Mauro Matteo Cascella <mcascell@redhat.com>
+Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
+Message-Id: <20220407081106.343235-1-mcascell@redhat.com>
+Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
+(cherry picked from commit 9569f5cb5b4bffa9d3ebc8ba7da1e03830a9a895)
+Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
+---
+ hw/display/qxl-render.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/hw/display/qxl-render.c b/hw/display/qxl-render.c
+index d28849b121..237ed293ba 100644
+--- a/hw/display/qxl-render.c
++++ b/hw/display/qxl-render.c
+@@ -266,7 +266,7 @@ static QEMUCursor *qxl_cursor(PCIQXLDevice *qxl, QXLCursor *cursor,
+         }
+         break;
+     case SPICE_CURSOR_TYPE_ALPHA:
+-        size = sizeof(uint32_t) * cursor->header.width * cursor->header.height;
++        size = sizeof(uint32_t) * c->width * c->height;
+         qxl_unpack_chunks(c->data, size, qxl, &cursor->chunk, group_id);
+         if (qxl->debug > 2) {
+             cursor_print_ascii_art(c, "qxl/alpha");

debian/patches/extra/0021-ui-cursor-fix-integer-overflow-in-cursor_alloc-CVE-2.patch

@@ -0,0 +1,83 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Mauro Matteo Cascella <mcascell@redhat.com>
+Date: Thu, 7 Apr 2022 10:17:12 +0200
+Subject: [PATCH] ui/cursor: fix integer overflow in cursor_alloc
+ (CVE-2021-4206)
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Prevent potential integer overflow by limiting 'width' and 'height' to
+512x512. Also change 'datasize' type to size_t. Refer to security
+advisory https://starlabs.sg/advisories/22-4206/ for more information.
+
+Fixes: CVE-2021-4206
+Signed-off-by: Mauro Matteo Cascella <mcascell@redhat.com>
+Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
+Message-Id: <20220407081712.345609-1-mcascell@redhat.com>
+Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
+(cherry picked from commit fa892e9abb728e76afcf27323ab29c57fb0fe7aa)
+Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
+---
+ hw/display/qxl-render.c | 7 +++++++
+ hw/display/vmware_vga.c | 2 ++
+ ui/cursor.c             | 8 +++++++-
+ 3 files changed, 16 insertions(+), 1 deletion(-)
+
+diff --git a/hw/display/qxl-render.c b/hw/display/qxl-render.c
+index 237ed293ba..ca217004bf 100644
+--- a/hw/display/qxl-render.c
++++ b/hw/display/qxl-render.c
+@@ -247,6 +247,13 @@ static QEMUCursor *qxl_cursor(PCIQXLDevice *qxl, QXLCursor *cursor,
+     size_t size;
+ 
+     c = cursor_alloc(cursor->header.width, cursor->header.height);
++
++    if (!c) {
++        qxl_set_guest_bug(qxl, "%s: cursor %ux%u alloc error", __func__,
++                cursor->header.width, cursor->header.height);
++        goto fail;
++    }
++
+     c->hot_x = cursor->header.hot_spot_x;
+     c->hot_y = cursor->header.hot_spot_y;
+     switch (cursor->header.type) {
+diff --git a/hw/display/vmware_vga.c b/hw/display/vmware_vga.c
+index e2969a6c81..2b81d6122f 100644
+--- a/hw/display/vmware_vga.c
++++ b/hw/display/vmware_vga.c
+@@ -509,6 +509,8 @@ static inline void vmsvga_cursor_define(struct vmsvga_state_s *s,
+     int i, pixels;
+ 
+     qc = cursor_alloc(c->width, c->height);
++    assert(qc != NULL);
++
+     qc->hot_x = c->hot_x;
+     qc->hot_y = c->hot_y;
+     switch (c->bpp) {
+diff --git a/ui/cursor.c b/ui/cursor.c
+index 1d62ddd4d0..835f0802f9 100644
+--- a/ui/cursor.c
++++ b/ui/cursor.c
+@@ -46,6 +46,8 @@ static QEMUCursor *cursor_parse_xpm(const char *xpm[])
+ 
+     /* parse pixel data */
+     c = cursor_alloc(width, height);
++    assert(c != NULL);
++
+     for (pixel = 0, y = 0; y < height; y++, line++) {
+         for (x = 0; x < height; x++, pixel++) {
+             idx = xpm[line][x];
+@@ -91,7 +93,11 @@ QEMUCursor *cursor_builtin_left_ptr(void)
+ QEMUCursor *cursor_alloc(int width, int height)
+ {
+     QEMUCursor *c;
+-    int datasize = width * height * sizeof(uint32_t);
++    size_t datasize = width * height * sizeof(uint32_t);
++
++    if (width > 512 || height > 512) {
++        return NULL;
++    }
+ 
+     c = g_malloc0(sizeof(QEMUCursor) + datasize);
+     c->width  = width;

debian/patches/series

@@ -15,6 +15,10 @@ extra/0014-vhost-vsock-detach-the-virqueue-element-in-case-of-e.patch
 extra/0015-vhost-user-remove-VirtQ-notifier-restore.patch
 extra/0016-vhost-user-fix-VirtQ-notifier-cleanup.patch
 extra/0017-virtio-fix-the-condition-for-iommu_platform-not-supp.patch
+extra/0018-block-gluster-correctly-set-max_pdiscard-which-is-in.patch
+extra/0019-ui-vnc.c-Fixed-a-deadlock-bug.patch
+extra/0020-display-qxl-render-fix-race-condition-in-qxl_cursor-.patch
+extra/0021-ui-cursor-fix-integer-overflow-in-cursor_alloc-CVE-2.patch
 bitmap-mirror/0001-drive-mirror-add-support-for-sync-bitmap-mode-never.patch
 bitmap-mirror/0002-drive-mirror-add-support-for-conditional-and-always-.patch
 bitmap-mirror/0003-mirror-add-check-for-bitmap-mode-without-bitmap.patch