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[188.141.5.72]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-493c636c8b9sm39551155e9.10.2026.07.02.03.34.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Jul 2026 03:34:54 -0700 (PDT) From: David Carlier To: dan.scally@ideasonboard.com, jacopo.mondi@ideasonboard.com, mchehab@kernel.org Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, David Carlier , stable@vger.kernel.org Subject: [PATCH] media: mali-c55: Fix unaligned access of AEC histogram zone weights Date: Thu, 2 Jul 2026 11:34:53 +0100 Message-ID: <20260702103453.348056-1-devnexen@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit mali_c55_params_aexp_hist_weights() packs the 225 per-zone u8 weights into the ISP registers four at a time by casting the zone_weights array to u32 and dereferencing it. The array sits at offset 10 within the parameter block, so it is only 2-byte aligned: the u32 access is unaligned, which is undefined behaviour and can fault on strict-align configurations or once the loop is auto-vectorised. The cast also reads the four weights in host byte order before they are written to the little-endian register, so on big-endian hosts the four weights packed into each register end up in the wrong byte lanes. Read the weights with get_unaligned_le32() instead, which is both alignment-safe and fixes the byte order regardless of host endianness. Fixes: d5f281f3dd29 ("media: mali-c55: Add Mali-C55 ISP driver") Cc: stable@vger.kernel.org Signed-off-by: David Carlier --- drivers/media/platform/arm/mali-c55/mali-c55-params.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/media/platform/arm/mali-c55/mali-c55-params.c b/drivers/media/platform/arm/mali-c55/mali-c55-params.c index de0e9d898..1aaf64dde 100644 --- a/drivers/media/platform/arm/mali-c55/mali-c55-params.c +++ b/drivers/media/platform/arm/mali-c55/mali-c55-params.c @@ -6,6 +6,7 @@ */ #include #include +#include #include #include @@ -203,7 +204,7 @@ mali_c55_params_aexp_hist_weights(struct mali_c55 *mali_c55, * of overwriting other registers. */ for (unsigned int i = 0; i < 56; i++) { - val = ((u32 *)params->zone_weights)[i] + val = get_unaligned_le32(¶ms->zone_weights[i * 4]) & MALI_C55_AEXP_HIST_ZONE_WEIGHT_MASK; addr = base + MALI_C55_AEXP_HIST_ZONE_WEIGHTS_OFFSET + (4 * i); -- 2.53.0