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hw/display/artist.c: fix out of bounds check 

Fix the following runtime warning with artist framebuffer:
"write outside bounds: wants 1256x1023, max size 1280x1024"

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Sven Schnelle <svens@stackframe.org>
Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Sven Schnelle 2020-02-29 10:50:40 +01:00 committed by Helge Deller
parent 28b71a2e42
commit a24d2cf30c
1 changed files with 11 additions and 13 deletions
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24
hw/display/artist.c
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@ -340,14 +340,13 @@ static void vram_bit_write(ARTISTState *s, int posx, int posy, bool incr_x,
{
struct vram_buffer *buf;
uint32_t vram_bitmask = s->vram_bitmask;
int mask, i, pix_count, pix_length, offset, height, width;
int mask, i, pix_count, pix_length, offset, width;
uint8_t *data8, *p;
pix_count = vram_write_pix_per_transfer(s);
pix_length = vram_pixel_length(s);
buf = vram_write_buffer(s);
height = buf->height;
width = buf->width;
if (s->cmap_bm_access) {
@ -367,13 +366,6 @@ static void vram_bit_write(ARTISTState *s, int posx, int posy, bool incr_x,
pix_count = size * 8;
}
if (posy * width + posx + pix_count > buf->size) {
qemu_log("write outside bounds: wants %dx%d, max size %dx%d\n",
posx, posy, width, height);
return;
}
switch (pix_length) {
case 0:
if (s->image_bitmap_op & 0x20000000) {
@ -381,8 +373,11 @@ static void vram_bit_write(ARTISTState *s, int posx, int posy, bool incr_x,
}
for (i = 0; i < pix_count; i++) {
artist_rop8(s, p + offset + pix_count - 1 - i,
(data & 1) ? (s->plane_mask >> 24) : 0);
uint32_t off = offset + pix_count - 1 - i;
if (off < buf->size) {
artist_rop8(s, p + off,
(data & 1) ? (s->plane_mask >> 24) : 0);
}
data >>= 1;
}
memory_region_set_dirty(&buf->mr, offset, pix_count);
@ -398,7 +393,10 @@ static void vram_bit_write(ARTISTState *s, int posx, int posy, bool incr_x,
for (i = 3; i >= 0; i--) {
if (!(s->image_bitmap_op & 0x20000000) ||
s->vram_bitmask & (1 << (28 + i))) {
artist_rop8(s, p + offset + 3 - i, data8[ROP8OFF(i)]);
uint32_t off = offset + 3 - i;
if (off < buf->size) {
artist_rop8(s, p + off, data8[ROP8OFF(i)]);
}
}
}
memory_region_set_dirty(&buf->mr, offset, 3);
@ -420,7 +418,7 @@ static void vram_bit_write(ARTISTState *s, int posx, int posy, bool incr_x,
break;
}
for (i = 0; i < pix_count; i++) {
for (i = 0; i < pix_count && offset + i < buf->size; i++) {
mask = 1 << (pix_count - 1 - i);
if (!(s->image_bitmap_op & 0x20000000) ||