linux-kernel - [PATCH] Dereference after free in snd_hwdep

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Message-ID: <451C5EAE.3050309@gmail.com>
Date:	Thu, 28 Sep 2006 19:45:50 -0400
From:	Florin Malita <fmalita@...il.com>
To:	perex@...e.cz
CC:	linux-kernel@...r.kernel.org, tiwai@...e.de
Subject: [PATCH] Dereference after free in snd_hwdep_release()

snd_card_file_remove() may free hw->card so we can't dereference
hw->card->module after that.

Coverity ID 1420.

Signed-off-by: Florin Malita <fmalita@...il.com>
---

diff --git a/sound/core/hwdep.c b/sound/core/hwdep.c
index 9aa9d94..46b4768 100644
--- a/sound/core/hwdep.c
+++ b/sound/core/hwdep.c
@@ -158,6 +158,7 @@ static int snd_hwdep_release(struct inod
 {
 	int err = -ENXIO;
 	struct snd_hwdep *hw = file->private_data;
+	struct module *mod = hw->card->module;
 	mutex_lock(&hw->open_mutex);
 	if (hw->ops.release) {
 		err = hw->ops.release(hw, file);
@@ -167,7 +168,7 @@ static int snd_hwdep_release(struct inod
 		hw->used--;
 	snd_card_file_remove(hw->card, file);
 	mutex_unlock(&hw->open_mutex);
-	module_put(hw->card->module);
+	module_put(mod);
 	return err;
 }
 


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