The PL011 TRM says that "The 16-bit integer is written to the Integer Baud Rate Register, UARTIBRD". Updated the handling of the UARTIBRD register to ensure only 16-bit values are written to it.
ASAN log: ==2973125==ERROR: AddressSanitizer: FPE on unknown address 0x55f72629b348 (pc 0x55f72629b348 bp 0x7fffa24d0e00 sp 0x7fffa24d0d60 T0) #0 0x55f72629b348 in pl011_get_baudrate hw/char/pl011.c:255:17 #1 0x55f726298d94 in pl011_trace_baudrate_change hw/char/pl011.c:260:33 #2 0x55f726296fc8 in pl011_write hw/char/pl011.c:378:9 Reproducer: cat << EOF | qemu-system-aarch64 -display \ none -machine accel=qtest, -m 512M -machine realview-pb-a8 -qtest stdio writeq 0x1000b024 0xf8000000 EOF Signed-off-by: Zheyu Ma <zheyum...@gmail.com> --- hw/char/pl011.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/char/pl011.c b/hw/char/pl011.c index 8753b84a84..f962786e2a 100644 --- a/hw/char/pl011.c +++ b/hw/char/pl011.c @@ -374,7 +374,7 @@ static void pl011_write(void *opaque, hwaddr offset, s->ilpr = value; break; case 9: /* UARTIBRD */ - s->ibrd = value; + s->ibrd = value & 0xFFFF; pl011_trace_baudrate_change(s); break; case 10: /* UARTFBRD */ -- 2.34.1