linux-kernel - [PATCH 1/3] bus: fsl-mc: Fix test for end of loop

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Message-Id: <20210208170949.3070898-2-ciorneiioana@gmail.com>
Date:   Mon,  8 Feb 2021 19:09:47 +0200
From:   Ioana Ciornei <ciorneiioana@...il.com>
To:     gregkh@...uxfoundation.org
Cc:     laurentiu.tudor@....com, linux-kernel@...r.kernel.org,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Ioana Ciornei <ioana.ciornei@....com>
Subject: [PATCH 1/3] bus: fsl-mc: Fix test for end of loop

From: Dan Carpenter <dan.carpenter@...cle.com>

The "desc" pointer can't possibly be NULL here.  If we can't find the
correct "desc" then tt points to the last element of the
fsl_mc_accepted_cmds[] array.  Fix this by testing if
"i == FSL_MC_NUM_ACCEPTED_CMDS" instead.

Fixes: 2cf1e703f066 ("bus: fsl-mc: add fsl-mc userspace support")
Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 drivers/bus/fsl-mc/fsl-mc-uapi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/bus/fsl-mc/fsl-mc-uapi.c b/drivers/bus/fsl-mc/fsl-mc-uapi.c
index eeb988c9f4bb..bdcd9d983a78 100644
--- a/drivers/bus/fsl-mc/fsl-mc-uapi.c
+++ b/drivers/bus/fsl-mc/fsl-mc-uapi.c
@@ -338,7 +338,7 @@ static int fsl_mc_command_check(struct fsl_mc_device *mc_dev,
 		if ((cmdid & desc->cmdid_mask) == desc->cmdid_value)
 			break;
 	}
-	if (!desc) {
+	if (i == FSL_MC_NUM_ACCEPTED_CMDS) {
 		dev_err(&mc_dev->dev, "MC command 0x%04x: cmdid not accepted\n", cmdid);
 		return -EACCES;
 	}
-- 
2.30.0