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drivers: timer: stm32 lptim fix Potentially overflow #31142

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Merged
merged 1 commit into from
Jan 27, 2021
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drivers: timer: stm32 lptim fix Potentially overflow #31142

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4 changes: 2 additions & 2 deletions drivers/timer/stm32_lptim_timer.c
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Original file line number Diff line number Diff line change
Expand Up @@ -291,7 +291,7 @@ uint32_t z_clock_elapsed(void)
/* gives the value of LPTIM1 counter (ms)
* since the previous 'announce'
*/
uint64_t ret = (lp_time * CONFIG_SYS_CLOCK_TICKS_PER_SEC) / LPTIM_CLOCK;
uint64_t ret = ((uint64_t)lp_time * CONFIG_SYS_CLOCK_TICKS_PER_SEC) / LPTIM_CLOCK;

return (uint32_t)(ret);
}
Expand All @@ -315,7 +315,7 @@ uint32_t z_timer_cycle_get_32(void)
lp_time += accumulated_lptim_cnt;

/* convert lptim count in a nb of hw cycles with precision */
uint64_t ret = lp_time * (sys_clock_hw_cycles_per_sec() / LPTIM_CLOCK);
uint64_t ret = ((uint64_t)lp_time * sys_clock_hw_cycles_per_sec()) / LPTIM_CLOCK;

k_spin_unlock(&lock, key);

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