linux-kernel - [PATCH 4/4] media: venus: hfi: add a check to handle OOB in sfr region

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Message-ID: <20241105-venus_oob-v1-4-8d4feedfe2bb@quicinc.com>
Date: Tue, 5 Nov 2024 14:24:57 +0530
From: Vikash Garodia <quic_vgarodia@...cinc.com>
To: Stanimir Varbanov <stanimir.k.varbanov@...il.com>,
        Bryan O'Donoghue
	<bryan.odonoghue@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
CC: <linux-media@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Vikash Garodia <quic_vgarodia@...cinc.com>, <stable@...r.kernel.org>
Subject: [PATCH 4/4] media: venus: hfi: add a check to handle OOB in sfr
 region

sfr->buf_size is in shared memory and can be modified by malicious user.
OOB write is possible when the size is made higher than actual sfr data
buffer.

Cc: stable@...r.kernel.org
Fixes: d96d3f30c0f2 ("[media] media: venus: hfi: add Venus HFI files")
Signed-off-by: Vikash Garodia <quic_vgarodia@...cinc.com>
---
 drivers/media/platform/qcom/venus/hfi_venus.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/qcom/venus/hfi_venus.c b/drivers/media/platform/qcom/venus/hfi_venus.c
index 50d92214190d88eff273a5ba3f95486f758bcc05..c19d6bf686d0f31c6a2f551de3f7eb08031bde85 100644
--- a/drivers/media/platform/qcom/venus/hfi_venus.c
+++ b/drivers/media/platform/qcom/venus/hfi_venus.c
@@ -1041,18 +1041,23 @@ static void venus_sfr_print(struct venus_hfi_device *hdev)
 {
 	struct device *dev = hdev->core->dev;
 	struct hfi_sfr *sfr = hdev->sfr.kva;
+	u32 size;
 	void *p;
 
 	if (!sfr)
 		return;
 
-	p = memchr(sfr->data, '\0', sfr->buf_size);
+	size = sfr->buf_size;
+	if (size > ALIGNED_SFR_SIZE)
+		return;
+
+	p = memchr(sfr->data, '\0', size);
 	/*
 	 * SFR isn't guaranteed to be NULL terminated since SYS_ERROR indicates
 	 * that Venus is in the process of crashing.
 	 */
 	if (!p)
-		sfr->data[sfr->buf_size - 1] = '\0';
+		sfr->data[size - 1] = '\0';
 
 	dev_err_ratelimited(dev, "SFR message from FW: %s\n", sfr->data);
 }

-- 
2.34.1