linux-kernel - [PATCH][next] media: venus: core,pm: fix potential infinite loop

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Message-Id: <20210407134831.494351-1-colin.king@canonical.com>
Date:   Wed,  7 Apr 2021 14:48:31 +0100
From:   Colin King <colin.king@...onical.com>
To:     Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] media: venus: core,pm: fix potential infinite loop

From: Colin Ian King <colin.king@...onical.com>

The for-loop iterates with a u8 loop counter i and compares this
with the loop upper limit of res->resets_num which is an unsigned
int type.  There is a potential infinite loop if res->resets_num
is larger than the u8 loop counter i. Fix this by making the loop
counter the same type as res->resets_num.

Addresses-Coverity: ("Infinite loop")
Fixes: 3bca43585e22 ("media: venus: core,pm: Add handling for resets")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/media/platform/qcom/venus/pm_helpers.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/qcom/venus/pm_helpers.c b/drivers/media/platform/qcom/venus/pm_helpers.c
index dfe3ee84eeb6..5c0a9aa23e83 100644
--- a/drivers/media/platform/qcom/venus/pm_helpers.c
+++ b/drivers/media/platform/qcom/venus/pm_helpers.c
@@ -868,7 +868,7 @@ static void vcodec_domains_put(struct venus_core *core)
 static int core_resets_reset(struct venus_core *core)
 {
 	const struct venus_resources *res = core->res;
-	unsigned char i;
+	unsigned int i;
 	int ret;
 
 	if (!res->resets_num)
@@ -893,7 +893,7 @@ static int core_resets_get(struct venus_core *core)
 {
 	struct device *dev = core->dev;
 	const struct venus_resources *res = core->res;
-	unsigned char i;
+	unsigned int i;
 	int ret;
 
 	if (!res->resets_num)
-- 
2.30.2