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| author | Prasad J Pandit <pjp@fedoraproject.org> | 2016-09-08 18:15:54 +0530 |
|---|---|---|
| committer | Gerd Hoffmann <kraxel@redhat.com> | 2016-09-13 09:24:35 +0200 |
| commit | 167d97a3def77ee2dbf6e908b0ecbfe2103977db (patch) | |
| tree | aa11611ba71df6ccf0c06efb072dda184e396935 | |
| parent | 7263da78045dc91cc207f350911efe4259e99b3c (diff) | |
| download | focaccia-qemu-167d97a3def77ee2dbf6e908b0ecbfe2103977db.tar.gz focaccia-qemu-167d97a3def77ee2dbf6e908b0ecbfe2103977db.zip | |
vmsvga: correct bitmap and pixmap size checks
When processing svga command DEFINE_CURSOR in vmsvga_fifo_run, the computed BITMAP and PIXMAP size are checked against the 'cursor.mask[]' and 'cursor.image[]' array sizes in bytes. Correct these checks to avoid OOB memory access. Reported-by: Qinghao Tang <luodalongde@gmail.com> Reported-by: Li Qiang <liqiang6-s@360.cn> Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org> Message-id: 1473338754-15430-1-git-send-email-ppandit@redhat.com Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
| -rw-r--r-- | hw/display/vmware_vga.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/hw/display/vmware_vga.c b/hw/display/vmware_vga.c index e51a05ea7e..6599cf078d 100644 --- a/hw/display/vmware_vga.c +++ b/hw/display/vmware_vga.c @@ -676,11 +676,13 @@ static void vmsvga_fifo_run(struct vmsvga_state_s *s) cursor.bpp = vmsvga_fifo_read(s); args = SVGA_BITMAP_SIZE(x, y) + SVGA_PIXMAP_SIZE(x, y, cursor.bpp); - if (cursor.width > 256 || - cursor.height > 256 || - cursor.bpp > 32 || - SVGA_BITMAP_SIZE(x, y) > sizeof cursor.mask || - SVGA_PIXMAP_SIZE(x, y, cursor.bpp) > sizeof cursor.image) { + if (cursor.width > 256 + || cursor.height > 256 + || cursor.bpp > 32 + || SVGA_BITMAP_SIZE(x, y) + > sizeof(cursor.mask) / sizeof(cursor.mask[0]) + || SVGA_PIXMAP_SIZE(x, y, cursor.bpp) + > sizeof(cursor.image) / sizeof(cursor.image[0])) { goto badcmd; } |