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Commit c2e1ce4f authored by Gustavo A. R. Silva's avatar Gustavo A. R. Silva Committed by Greg Kroah-Hartman
Browse files

ARM: OMAP2+: Fix -Warray-bounds warning in _pwrdm_state_switch() 

commit 847fb80cc01a54bc827b02547bb8743bdb59ddab upstream.

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: ba20bb12 ("OMAP: PM counter infrastructure.")
Cc: stable@vger.kernel.org
Reported-by: default avatarkernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/lkml/20230607050639.LzbPn%25lkp@intel.com/


Signed-off-by: default avatarGustavo A. R. Silva <gustavoars@kernel.org>
Message-ID: <ZIFVGwImU3kpaGeH@work>
Acked-by: default avatarArd Biesheuvel <ardb@kernel.org>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent f53ab5a2

arch/arm/mach-omap2/powerdomain.c

+1 −1
Original line number Diff line number Diff line
@@ -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);