linux-kernel - [PATCH] staging: most: avoid null pointer dereference when iface is null

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Message-Id: <20200624163957.11676-1-colin.king@canonical.com>
Date:   Wed, 24 Jun 2020 17:39:57 +0100
From:   Colin King <colin.king@...onical.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Christian Gromm <christian.gromm@...rochip.com>
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] staging: most: avoid null pointer dereference when iface is null

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

In the case where the pointer iface is null then the reporting of this
error will dereference iface when printing an error message causing which
is not ideal.  Since the majority of callers to most_register_interface
report an error when -EINVAL is returned a simple fix is to just remove
the error message, I doubt it will be missed.

Addresses-Coverity: ("Dereference after null check")
Fixes: 57562a72414c ("Staging: most: add MOST driver's core module")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/most/core.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/most/core.c b/drivers/most/core.c
index f781c46cd4af..353ab277cbc6 100644
--- a/drivers/most/core.c
+++ b/drivers/most/core.c
@@ -1283,10 +1283,8 @@ int most_register_interface(struct most_interface *iface)
 	struct most_channel *c;
 
 	if (!iface || !iface->enqueue || !iface->configure ||
-	    !iface->poison_channel || (iface->num_channels > MAX_CHANNELS)) {
-		dev_err(iface->dev, "Bad interface or channel overflow\n");
+	    !iface->poison_channel || (iface->num_channels > MAX_CHANNELS))
 		return -EINVAL;
-	}
 
 	id = ida_simple_get(&mdev_id, 0, 0, GFP_KERNEL);
 	if (id < 0) {
-- 
2.27.0