qemu: CVE-2020-27821 heap buffer overflow in msix_table_mmio_write

Source: https://git.qemu.org/?p=qemu.git;
MR: 107558
Type: Security Fix
Disposition: Backport from https://git.qemu.org/?p=qemu.git;a=commit;h=4bfb024bc76973d40a359476dc0291f46e435442


ChangeID: c5d25422f43edb7d8728118eb482eba09474ef2c
Description:
          CVE-2020-27821 qemu: heap buffer overflow in msix_table_mmio_write() in hw/pci/msix.c.

Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>