If function pwrdm_read_prev_pwrst() returns -EINVAL, we will end up accessing array pwrdm->state_counter through negative index -22. This is wrong and the compiler is legitimately warning us about this potential problem. Fix this by sanity checking the value stored in variable _prev_ before accessing array pwrdm->state_counter. Address the following -Warray-bounds warning: arch/arm/mach-omap2/powerdomain.c:178:45: warning: array subscript -22 is below array bounds of 'unsigned int[4]' [-Warray-bounds] Link: https://github.com/KSPP/linux/issues/307 Fixes: ba20bb126940 ("OMAP: PM counter infrastructure.") Cc: stable@xxxxxxxxxxxxxxx Reported-by: kernel test robot <lkp@xxxxxxxxx> Link: https://lore.kernel.org/lkml/20230607050639.LzbPn%25lkp@xxxxxxxxx/ Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx> --- arch/arm/mach-omap2/powerdomain.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c index 777f9f8e7cd8..5e05dd1324e7 100644 --- a/arch/arm/mach-omap2/powerdomain.c +++ b/arch/arm/mach-omap2/powerdomain.c @@ -174,7 +174,7 @@ static int _pwrdm_state_switch(struct powerdomain *pwrdm, int flag) break; case PWRDM_STATE_PREV: prev = pwrdm_read_prev_pwrst(pwrdm); - if (pwrdm->state != prev) + if (prev >= 0 && pwrdm->state != prev) pwrdm->state_counter[prev]++; if (prev == PWRDM_POWER_RET) _update_logic_membank_counters(pwrdm); -- 2.34.1
