linux-kernel - [PATCH] firmware: Always initialize the fw

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Date:   Wed, 19 Sep 2018 18:09:38 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        stable@...r.kernel.org, Rishabh Bhatnagar <rishabhb@...eaurora.org>
Subject: [PATCH] firmware: Always initialize the fw_priv list object

When freeing the fw_priv the item is taken off the list. This causes an
oops in the FW_OPT_NOCACHE case as the list object is not initialized.

Make sure to initialize the list object regardless of this flag.

Fixes: 422b3db2a503 ("firmware: Fix security issue with request_firmware_into_buf()")
Cc: stable@...r.kernel.org
Cc: Rishabh Bhatnagar <rishabhb@...eaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
---
 drivers/base/firmware_loader/main.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/base/firmware_loader/main.c b/drivers/base/firmware_loader/main.c
index b3c0498ee433..8e9213b36e31 100644
--- a/drivers/base/firmware_loader/main.c
+++ b/drivers/base/firmware_loader/main.c
@@ -226,8 +226,11 @@ static int alloc_lookup_fw_priv(const char *fw_name,
 	}
 
 	tmp = __allocate_fw_priv(fw_name, fwc, dbuf, size);
-	if (tmp && !(opt_flags & FW_OPT_NOCACHE))
-		list_add(&tmp->list, &fwc->head);
+	if (tmp) {
+		INIT_LIST_HEAD(&tmp->list);
+		if (!(opt_flags & FW_OPT_NOCACHE))
+			list_add(&tmp->list, &fwc->head);
+	}
 	spin_unlock(&fwc->lock);
 
 	*fw_priv = tmp;
-- 
2.18.0