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From: Dan Carpenter <dan.carpenter@oracle.com>
To: Jassi Brar
	<jassisinghbrar-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Thierry Reding
	<thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>,
	Alexandre Courbot
	<gnurou-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	kernel-janitors-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: [patch] mailbox/tegra-hsp: Use after free in tegra_hsp_remove_doorbells()
Date: Fri, 18 Nov 2016 11:34:10 +0000	[thread overview]
Message-ID: <20161118113410.GC3150@mwanda> (raw)

We have to use the _safe version of list_for_each() because we're
freeing the pointer as we go along.  (This might not show up testing
depending on what config options you have enabled).

Fixes: ed65ee43e397 ("mailbox: Add Tegra HSP driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

diff --git a/drivers/mailbox/tegra-hsp.c b/drivers/mailbox/tegra-hsp.c
index 17b256a..87be8d3 100644
--- a/drivers/mailbox/tegra-hsp.c
+++ b/drivers/mailbox/tegra-hsp.c
@@ -397,12 +397,12 @@ static struct mbox_chan *of_tegra_hsp_xlate(struct mbox_controller *mbox,
 
 static void tegra_hsp_remove_doorbells(struct tegra_hsp *hsp)
 {
-	struct tegra_hsp_doorbell *db;
+	struct tegra_hsp_doorbell *db, *tmp;
 	unsigned long flags;
 
 	spin_lock_irqsave(&hsp->lock, flags);
 
-	list_for_each_entry(db, &hsp->doorbells, list)
+	list_for_each_entry_safe(db, tmp, &hsp->doorbells, list)
 		__tegra_hsp_doorbell_destroy(db);
 
 	spin_unlock_irqrestore(&hsp->lock, flags);

WARNING: multiple messages have this Message-ID (diff)
From: Dan Carpenter <dan.carpenter-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
To: Jassi Brar
	<jassisinghbrar-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Thierry Reding
	<thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>,
	Alexandre Courbot
	<gnurou-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	kernel-janitors-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: [patch] mailbox/tegra-hsp: Use after free in tegra_hsp_remove_doorbells()
Date: Fri, 18 Nov 2016 14:34:10 +0300	[thread overview]
Message-ID: <20161118113410.GC3150@mwanda> (raw)

We have to use the _safe version of list_for_each() because we're
freeing the pointer as we go along.  (This might not show up testing
depending on what config options you have enabled).

Fixes: ed65ee43e397 ("mailbox: Add Tegra HSP driver")
Signed-off-by: Dan Carpenter <dan.carpenter-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>

diff --git a/drivers/mailbox/tegra-hsp.c b/drivers/mailbox/tegra-hsp.c
index 17b256a..87be8d3 100644
--- a/drivers/mailbox/tegra-hsp.c
+++ b/drivers/mailbox/tegra-hsp.c
@@ -397,12 +397,12 @@ static struct mbox_chan *of_tegra_hsp_xlate(struct mbox_controller *mbox,
 
 static void tegra_hsp_remove_doorbells(struct tegra_hsp *hsp)
 {
-	struct tegra_hsp_doorbell *db;
+	struct tegra_hsp_doorbell *db, *tmp;
 	unsigned long flags;
 
 	spin_lock_irqsave(&hsp->lock, flags);
 
-	list_for_each_entry(db, &hsp->doorbells, list)
+	list_for_each_entry_safe(db, tmp, &hsp->doorbells, list)
 		__tegra_hsp_doorbell_destroy(db);
 
 	spin_unlock_irqrestore(&hsp->lock, flags);

             reply	other threads:[~2016-11-18 11:34 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-11-18 11:34 Dan Carpenter [this message]
2016-11-18 11:34 ` [patch] mailbox/tegra-hsp: Use after free in tegra_hsp_remove_doorbells() Dan Carpenter
2016-11-18 13:31 ` Thierry Reding
2016-11-18 13:31   ` Thierry Reding

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