diff options
| author | Roland Dreier <rdreier@cisco.com> | 2010-01-05 20:43:34 -0800 |
|---|---|---|
| committer | Anthony Liguori <aliguori@us.ibm.com> | 2010-01-11 10:03:39 -0600 |
| commit | e1daf40e3e61537da1509236dadc23ca8c4bc0e6 (patch) | |
| tree | 402f608ed493fa2f029e51187c57776bdaa09fe4 | |
| parent | de3ea06d59a110eb401c543b992dd85779ed8362 (diff) | |
vmware_vga: Check cursor dimensions passed from guest to avoid buffer overflow
Check that the cursor dimensions passed from the guest for the
DEFINE_CURSOR command don't overflow the available space in the
cursor.image[] or cursor.mask[] arrays before copying data from the
guest into those arrays.
Signed-off-by: Roland Dreier <rolandd@cisco.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
(cherry picked from commit f2d928d44ebc918750c94f3605c1417f1f653ec9)
| -rw-r--r-- | hw/vmware_vga.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/hw/vmware_vga.c b/hw/vmware_vga.c index 7ab1c7910b..5e969aedb4 100644 --- a/hw/vmware_vga.c +++ b/hw/vmware_vga.c @@ -562,6 +562,13 @@ static void vmsvga_fifo_run(struct vmsvga_state_s *s) cursor.height = y = vmsvga_fifo_read(s); vmsvga_fifo_read(s); cursor.bpp = vmsvga_fifo_read(s); + + if (SVGA_BITMAP_SIZE(x, y) > sizeof cursor.mask || + SVGA_PIXMAP_SIZE(x, y, cursor.bpp) > sizeof cursor.image) { + args = SVGA_BITMAP_SIZE(x, y) + SVGA_PIXMAP_SIZE(x, y, cursor.bpp); + goto badcmd; + } + for (args = 0; args < SVGA_BITMAP_SIZE(x, y); args ++) cursor.mask[args] = vmsvga_fifo_read_raw(s); for (args = 0; args < SVGA_PIXMAP_SIZE(x, y, cursor.bpp); args ++) |