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vga: fix for CVE-2018-5683 

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Merge remote-tracking branch 'remotes/kraxel/tags/vga-20180125-pull-request' into staging

vga: fix for CVE-2018-5683

# gpg: Signature made Thu 25 Jan 2018 09:33:23 GMT
# gpg:                using RSA key 0x4CB6D8EED3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>"
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>"
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>"
# Primary key fingerprint: A032 8CFF B93A 17A7 9901  FE7D 4CB6 D8EE D3E8 7138

* remotes/kraxel/tags/vga-20180125-pull-request:
  vga: check the validation of memory addr when draw text

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2018-01-25 15:28:56 +00:00
parent 0f79bfe38a 191f59dc17
commit b3bbe959b5
1 changed files with 3 additions and 0 deletions
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3
hw/display/vga.c
View File

@ -1279,6 +1279,9 @@ static void vga_draw_text(VGACommonState *s, int full_update)
cx_min = width;
cx_max = -1;
for(cx = 0; cx < width; cx++) {
if (src + sizeof(uint16_t) > s->vram_ptr + s->vram_size) {
break;
}
ch_attr = *(uint16_t *)src;
if (full_update || ch_attr != *ch_attr_ptr || src == cursor_ptr) {
if (cx < cx_min)