linux-kernel - [PATCH 147/190] Revert "media: dvb: add return value check on Write16"

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Message-Id: <20210421130105.1226686-148-gregkh@linuxfoundation.org>
Date:   Wed, 21 Apr 2021 15:00:22 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Aditya Pakki <pakki001@....edu>, Sean Young <sean@...s.org>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Subject: [PATCH 147/190] Revert "media: dvb: add return value check on Write16"

This reverts commit 0f787c12ee7b2b41a74594ed158a0112736f4e4e.

Commits from @umn.edu addresses have been found to be submitted in "bad
faith" to try to test the kernel community's ability to review "known
malicious" changes.  The result of these submissions can be found in a
paper published at the 42nd IEEE Symposium on Security and Privacy
entitled, "Open Source Insecurity: Stealthily Introducing
Vulnerabilities via Hypocrite Commits" written by Qiushi Wu (University
of Minnesota) and Kangjie Lu (University of Minnesota).

Because of this, all submissions from this group must be reverted from
the kernel tree and will need to be re-reviewed again to determine if
they actually are a valid fix.  Until that work is complete, remove this
change to ensure that no problems are being introduced into the
codebase.

Cc: Aditya Pakki <pakki001@....edu>
Cc: Sean Young <sean@...s.org>
Cc: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/media/dvb-frontends/drxd_hard.c | 30 +++++++++----------------
 1 file changed, 11 insertions(+), 19 deletions(-)

diff --git a/drivers/media/dvb-frontends/drxd_hard.c b/drivers/media/dvb-frontends/drxd_hard.c
index a7eb81df88c2..3e3de6badc86 100644
--- a/drivers/media/dvb-frontends/drxd_hard.c
+++ b/drivers/media/dvb-frontends/drxd_hard.c
@@ -1132,8 +1132,6 @@ static int EnableAndResetMB(struct drxd_state *state)
 
 static int InitCC(struct drxd_state *state)
 {
-	int status = 0;
-
 	if (state->osc_clock_freq == 0 ||
 	    state->osc_clock_freq > 20000 ||
 	    (state->osc_clock_freq % 4000) != 0) {
@@ -1141,17 +1139,14 @@ static int InitCC(struct drxd_state *state)
 		return -1;
 	}
 
-	status |= Write16(state, CC_REG_OSC_MODE__A, CC_REG_OSC_MODE_M20, 0);
-	status |= Write16(state, CC_REG_PLL_MODE__A,
-				CC_REG_PLL_MODE_BYPASS_PLL |
-				CC_REG_PLL_MODE_PUMP_CUR_12, 0);
-	status |= Write16(state, CC_REG_REF_DIVIDE__A,
-				state->osc_clock_freq / 4000, 0);
-	status |= Write16(state, CC_REG_PWD_MODE__A, CC_REG_PWD_MODE_DOWN_PLL,
-				0);
-	status |= Write16(state, CC_REG_UPDATE__A, CC_REG_UPDATE_KEY, 0);
+	Write16(state, CC_REG_OSC_MODE__A, CC_REG_OSC_MODE_M20, 0);
+	Write16(state, CC_REG_PLL_MODE__A, CC_REG_PLL_MODE_BYPASS_PLL |
+		CC_REG_PLL_MODE_PUMP_CUR_12, 0);
+	Write16(state, CC_REG_REF_DIVIDE__A, state->osc_clock_freq / 4000, 0);
+	Write16(state, CC_REG_PWD_MODE__A, CC_REG_PWD_MODE_DOWN_PLL, 0);
+	Write16(state, CC_REG_UPDATE__A, CC_REG_UPDATE_KEY, 0);
 
-	return status;
+	return 0;
 }
 
 static int ResetECOD(struct drxd_state *state)
@@ -1305,10 +1300,7 @@ static int SC_SendCommand(struct drxd_state *state, u16 cmd)
 	int status = 0, ret;
 	u16 errCode;
 
-	status = Write16(state, SC_RA_RAM_CMD__A, cmd, 0);
-	if (status < 0)
-		return status;
-
+	Write16(state, SC_RA_RAM_CMD__A, cmd, 0);
 	SC_WaitForReady(state);
 
 	ret = Read16(state, SC_RA_RAM_CMD_ADDR__A, &errCode, 0);
@@ -1335,9 +1327,9 @@ static int SC_ProcStartCommand(struct drxd_state *state,
 			break;
 		}
 		SC_WaitForReady(state);
-		status |= Write16(state, SC_RA_RAM_CMD_ADDR__A, subCmd, 0);
-		status |= Write16(state, SC_RA_RAM_PARAM1__A, param1, 0);
-		status |= Write16(state, SC_RA_RAM_PARAM0__A, param0, 0);
+		Write16(state, SC_RA_RAM_CMD_ADDR__A, subCmd, 0);
+		Write16(state, SC_RA_RAM_PARAM1__A, param1, 0);
+		Write16(state, SC_RA_RAM_PARAM0__A, param0, 0);
 
 		SC_SendCommand(state, SC_RA_RAM_CMD_PROC_START);
 	} while (0);
-- 
2.31.1