Akihiko Odaki c21a2456b6 hw/timer/hpet: Fix expiration time overflow ... The expiration time provided for timer_mod() can overflow if a ridiculously large value is set to the comparator register. The resulting value can represent a past time after rounded, forcing the timer to fire immediately. If the timer is configured as periodic, it will rearm the timer again, and form an endless loop. Check if the expiration value will overflow, and if it will, stop the timer instead of rearming the timer with the overflowed time. This bug was found by Alexander Bulekov when fuzzing igb, a new network device emulation: https://patchew.org/QEMU/20230129053316.1071513-1-alxndr@bu.edu/ The fixed test case is: fuzz/crash_2d7036941dcda1ad4380bb8a9174ed0c949bcefd Fixes: 16b29ae180 ("Add HPET emulation to qemu (Beth Kon)") Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Message-Id: <20230131030037.18856-1-akihiko.odaki@daynix.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> (cherry picked from commit 37d2bcbc2a) Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>		2023-03-29 10:20:04 +03:00
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a9gtimer.c
allwinner-a10-pit.c
altera_timer.c
arm_mptimer.c
arm_timer.c
armv7m_systick.c
aspeed_timer.c
avr_timer16.c
bcm2835_systmr.c
cadence_ttc.c
cmsdk-apb-dualtimer.c
cmsdk-apb-timer.c
digic-timer.c
etraxfs_timer.c
exynos4210_mct.c
exynos4210_pwm.c
grlib_gptimer.c
hpet.c	hw/timer/hpet: Fix expiration time overflow	2023-03-29 10:20:04 +03:00
i8254_common.c
i8254.c
ibex_timer.c
imx_epit.c	target/imx: reload cmp timer outside of the reload ptimer transaction	2022-10-27 10:27:23 +01:00
imx_gpt.c
Kconfig
meson.build
mips_gictimer.c
mss-timer.c
npcm7xx_timer.c
nrf51_timer.c
omap_gptimer.c
omap_synctimer.c
pxa2xx_timer.c
renesas_cmt.c
renesas_tmr.c
sh_timer.c
sifive_pwm.c
slavio_timer.c
sse-counter.c
sse-timer.c
stellaris-gptm.c
stm32f2xx_timer.c
trace-events
trace.h
xilinx_timer.c