linux-kernel - [PATCH v2 2/4] venus: hfi: fix the check to handle session buffer requirement

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Date:   Thu, 10 Aug 2023 07:55:02 +0530
From:   Vikash Garodia <quic_vgarodia@...cinc.com>
To:     <stanimir.k.varbanov@...il.com>, <bryan.odonoghue@...aro.org>,
        <agross@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <mchehab@...nel.org>,
        <hans.verkuil@...co.com>, <tfiga@...omium.org>
CC:     <linux-media@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>,
        Vikash Garodia <quic_vgarodia@...cinc.com>
Subject: [PATCH v2 2/4] venus: hfi: fix the check to handle session buffer requirement

Buffer requirement, for different buffer type, comes from video firmware.
While copying these requirements, there is an OOB possibility when the
payload from firmware is more than expected size. Fix the check to avoid
the OOB possibility.

Cc: stable@...r.kernel.org
Fixes: 09c2845e8fe4 ("[media] media: venus: hfi: add Host Firmware Interface (HFI)")
Reviewed-by: Nathan Hebert <nhebert@...omium.org>
Signed-off-by: Vikash Garodia <quic_vgarodia@...cinc.com>
---
 drivers/media/platform/qcom/venus/hfi_msgs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/platform/qcom/venus/hfi_msgs.c b/drivers/media/platform/qcom/venus/hfi_msgs.c
index 3d5dadf..3e85bd8 100644
--- a/drivers/media/platform/qcom/venus/hfi_msgs.c
+++ b/drivers/media/platform/qcom/venus/hfi_msgs.c
@@ -398,7 +398,7 @@ session_get_prop_buf_req(struct hfi_msg_session_property_info_pkt *pkt,
 		memcpy(&bufreq[idx], buf_req, sizeof(*bufreq));
 		idx++;
 
-		if (idx > HFI_BUFFER_TYPE_MAX)
+		if (idx >= HFI_BUFFER_TYPE_MAX)
 			return HFI_ERR_SESSION_INVALID_PARAMETER;
 
 		req_bytes -= sizeof(struct hfi_buffer_requirements);
-- 
2.7.4