[Coverity CID :215253] Unintentional integer overflow in drivers/timer/stm32_lptim_timer.c

[zephyrbot]

Static code scan issues found in file:

https://github.com/zephyrproject-rtos/zephyr/tree/c9a2a5e7fb0194bfb168f5aa1a0a83c73f62acb3/drivers/timer/stm32_lptim_timer.c#L289

Category: Integer handling issues
Function: z_clock_elapsed
Component: Drivers
CID: 215253

Details:

283    
284         k_spin_unlock(&lock, key);
285    
286         /* gives the value of LPTIM1 counter (ms)
287          * since the previous 'announce'
288          */
>>>     CID 215253:  Integer handling issues  (OVERFLOW_BEFORE_WIDEN)
>>>     Potentially overflowing expression "lp_time * 4096U" with type "unsigned int" (32 bits, unsigned) is evaluated using 32-bit arithmetic, and then used in a context that expects an expression of type "uint64_t" (64 bits, unsigned).
289         uint64_t ret = (lp_time * CONFIG_SYS_CLOCK_TICKS_PER_SEC) / LPTIM_CLOCK;
290    
291         return (uint32_t)(ret);
292     }
293    
294     uint32_t z_timer_cycle_get_32(void)

Please fix or provide comments in coverity using the link:

https://scan9.coverity.com/reports.htm#v32951/p12996.

Note: This issue was created automatically. Priority was set based on classification
of the file affected and the impact field in coverity. Assignees were set using the CODEOWNERS file.

[github-actions]

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