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Wed, 17 Jun 2026 14:25:25 -0700 (PDT) Received: from node ([202.47.63.86]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4606f2e6a8fsm58396109f8f.37.2026.06.17.14.25.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Jun 2026 14:25:25 -0700 (PDT) From: Muhammad Bilal To: jeff.hugo@oss.qualcomm.com Cc: carl.vanderlip@oss.qualcomm.com, ogabbay@kernel.org, dan.carpenter@linaro.org, linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Muhammad Bilal Subject: [PATCH] accel/qaic: use sizeof(*trans_hdr) for transaction length check Date: Thu, 18 Jun 2026 02:25:20 +0500 Message-ID: <20260617212520.59801-1-meatuni001@gmail.com> X-Mailer: git-send-email 2.54.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit In encode_message() the per-transaction lower-bound check compares trans_hdr->len against sizeof(trans_hdr), i.e. the size of the pointer, instead of sizeof(*trans_hdr), the size of struct qaic_manage_trans_hdr. Every other length check in this file (encode_message() at the loop guard, decode_message(), etc.) correctly uses sizeof(*trans_hdr), so this is an inconsistency. On 64-bit builds the pointer and the struct are both 8 bytes, so the check is correct by coincidence and there is no behavioural change. On 32-bit builds the pointer is 4 bytes, which weakens the minimum-length check below the 8-byte header size. Use sizeof(*trans_hdr) so the check validates against the actual transaction header size on all builds. Fixes: ea33cb6fc278 ("accel/qaic: tighten bounds checking in encode_message()") Signed-off-by: Muhammad Bilal --- drivers/accel/qaic/qaic_control.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/accel/qaic/qaic_control.c b/drivers/accel/qaic/qaic_control.c index 43f84d4389602..4d4e789d5fcb8 100644 --- a/drivers/accel/qaic/qaic_control.c +++ b/drivers/accel/qaic/qaic_control.c @@ -786,7 +786,7 @@ static int encode_message(struct qaic_device *qdev, struct manage_msg *user_msg, break; } trans_hdr = (struct qaic_manage_trans_hdr *)(user_msg->data + user_len); - if (trans_hdr->len < sizeof(trans_hdr) || + if (trans_hdr->len < sizeof(*trans_hdr) || size_add(user_len, trans_hdr->len) > user_msg->len) { ret = -EINVAL; break; -- 2.54.0