linux-kernel - [PATCH v2 1/4] media: venus: hfi_parser: add check to avoid out of bound access

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Message-ID: <20241128-venus_oob_2-v2-1-483ae0a464b8@quicinc.com>
Date: Thu, 28 Nov 2024 10:35:11 +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>,
        Tomasz Figa <tfiga@...omium.org>,
        Hans Verkuil <hans.verkuil@...co.com>
CC: Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        Mauro Carvalho Chehab
	<mchehab+samsung@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        <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 v2 1/4] media: venus: hfi_parser: add check to avoid out of
 bound access

There is a possibility that init_codecs is invoked multiple times during
manipulated payload from video firmware. In such case, if codecs_count
can get incremented to value more than MAX_CODEC_NUM, there can be OOB
access. Reset the count so that it always starts from beginning.

Cc: stable@...r.kernel.org
Fixes: 1a73374a04e5 ("media: venus: hfi_parser: add common capability parser")
Signed-off-by: Vikash Garodia <quic_vgarodia@...cinc.com>
---
 drivers/media/platform/qcom/venus/hfi_parser.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/media/platform/qcom/venus/hfi_parser.c b/drivers/media/platform/qcom/venus/hfi_parser.c
index 3df241dc3a118bcdeb2c28a6ffdb907b644d5653..1cc17f3dc8948160ea6c3015d2c03e475b8aa29e 100644
--- a/drivers/media/platform/qcom/venus/hfi_parser.c
+++ b/drivers/media/platform/qcom/venus/hfi_parser.c
@@ -17,6 +17,7 @@ typedef void (*func)(struct hfi_plat_caps *cap, const void *data,
 static void init_codecs(struct venus_core *core)
 {
 	struct hfi_plat_caps *caps = core->caps, *cap;
+	core->codecs_count = 0;
 	unsigned long bit;
 
 	if (hweight_long(core->dec_codecs) + hweight_long(core->enc_codecs) > MAX_CODEC_NUM)

-- 
2.34.1