diff options
| author | Prasad J Pandit <pjp@fedoraproject.org> | 2020-10-21 16:08:18 +0530 |
|---|---|---|
| committer | Gerd Hoffmann <kraxel@redhat.com> | 2020-11-04 08:25:17 +0100 |
| commit | ca1f9cbfdce4d63b10d57de80fef89a89d92a540 (patch) | |
| tree | f31d58ba6405f3958a29ab295ad15b0d78b3a7d8 | |
| parent | 2ddafce7f797082ad216657c830afd4546f16e37 (diff) | |
ati: check x y display parameter values
The source and destination x,y display parameters in ati_2d_blt()
may run off the vga limits if either of s->regs.[src|dst]_[xy] is
zero. Check the parameter values to avoid potential crash.
Reported-by: Gaoning Pan <pgn@zju.edu.cn>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Message-id: 20201021103818.1704030-1-ppandit@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
| -rw-r--r-- | hw/display/ati_2d.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/hw/display/ati_2d.c b/hw/display/ati_2d.c index 23a8ae0cd8..4dc10ea795 100644 --- a/hw/display/ati_2d.c +++ b/hw/display/ati_2d.c @@ -75,8 +75,9 @@ void ati_2d_blt(ATIVGAState *s) dst_stride *= bpp; } uint8_t *end = s->vga.vram_ptr + s->vga.vram_size; - if (dst_bits >= end || dst_bits + dst_x + (dst_y + s->regs.dst_height) * - dst_stride >= end) { + if (dst_x > 0x3fff || dst_y > 0x3fff || dst_bits >= end + || dst_bits + dst_x + + (dst_y + s->regs.dst_height) * dst_stride >= end) { qemu_log_mask(LOG_UNIMP, "blt outside vram not implemented\n"); return; } @@ -107,8 +108,9 @@ void ati_2d_blt(ATIVGAState *s) src_bits += s->regs.crtc_offset & 0x07ffffff; src_stride *= bpp; } - if (src_bits >= end || src_bits + src_x + - (src_y + s->regs.dst_height) * src_stride >= end) { + if (src_x > 0x3fff || src_y > 0x3fff || src_bits >= end + || src_bits + src_x + + (src_y + s->regs.dst_height) * src_stride >= end) { qemu_log_mask(LOG_UNIMP, "blt outside vram not implemented\n"); return; } |