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Tsirkin" , Yi Ren , QEMU Developers , Ren Ding , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Hanqing Zhao Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" From: Prasad J Pandit While reading PCI configuration bytes, a guest may send an address towards the end of the configuration space. It may lead to an OOB access issue. Add check to ensure 'address + size' is within PCI configuration space. Reported-by: Ren Ding Reported-by: Hanqing Zhao Reported-by: Yi Ren Suggested-by: BALATON Zoltan Signed-off-by: Prasad J Pandit --- hw/display/ati.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) Update v3: avoid modifying 'addr' variable -> https://lists.gnu.org/archive/html/qemu-devel/2020-06/msg00834.html diff --git a/hw/display/ati.c b/hw/display/ati.c index 67604e68de..b4d0fd88b7 100644 --- a/hw/display/ati.c +++ b/hw/display/ati.c @@ -387,7 +387,9 @@ static uint64_t ati_mm_read(void *opaque, hwaddr addr, = unsigned int size) val =3D s->regs.crtc_pitch; break; case 0xf00 ... 0xfff: - val =3D pci_default_read_config(&s->dev, addr - 0xf00, size); + if ((addr - 0xf00) + size <=3D pci_config_size(&s->dev)) { + val =3D pci_default_read_config(&s->dev, addr - 0xf00, size); + } break; case CUR_OFFSET: val =3D s->regs.cur_offset; --=20 2.26.2