linux-kernel - [27/53] ALSA: hda - fix ELD memory leak

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Date:	Tue, 22 Nov 2011 16:25:27 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Pierre-louis Bossart <pierre-louis.bossart@...el.com>,
	Stephen Warren <swarren@...dia.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Takashi Iwai <tiwai@...e.de>
Subject: [27/53] ALSA: hda - fix ELD memory leak

3.1-stable review patch.  If anyone has any objections, please let me know.

------------------


Backported from commit b95d68b8179764e29558b75cec35ef4a6a98925b.

memset(eld) clears eld->proc_entry which will leak the struct
snd_info_entry when unloading module.

Fix it by
- memset only the fields before eld->eld_buffer
- set eld->eld_valid to true _after_ all eld fields have been filled

Cc: Pierre-louis Bossart <pierre-louis.bossart@...el.com>
Acked-by: Stephen Warren <swarren@...dia.com>
Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 sound/pci/hda/hda_eld.c    |    5 +----
 sound/pci/hda/patch_hdmi.c |   15 +++++++++------
 2 files changed, 10 insertions(+), 10 deletions(-)

--- a/sound/pci/hda/hda_eld.c
+++ b/sound/pci/hda/hda_eld.c
@@ -297,10 +297,10 @@ static int hdmi_update_eld(struct hdmi_e
 					buf + ELD_FIXED_BYTES + mnl + 3 * i);
 	}
 
+	e->eld_valid = true;
 	return 0;
 
 out_fail:
-	e->eld_ver = 0;
 	return -EINVAL;
 }
 
@@ -318,9 +318,6 @@ int snd_hdmi_get_eld(struct hdmi_eld *el
 	int size;
 	unsigned char *buf;
 
-	if (!eld->eld_valid)
-		return -ENOENT;
-
 	size = snd_hdmi_get_eld_size(codec, nid);
 	if (size == 0) {
 		/* wfg: workaround for ASUS P5E-VM HDMI board */
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -920,20 +920,23 @@ static void hdmi_present_sense(struct hd
 	 * the unsolicited response to avoid custom WARs.
 	 */
 	int present = snd_hda_pin_sense(codec, pin_nid);
+	bool eld_valid = false;
 
-	memset(eld, 0, sizeof(*eld));
+#ifdef CONFIG_PROC_FS
+	memset(eld, 0, offsetof(struct hdmi_eld, proc_entry));
+#else
+	memset(eld, 0, sizeof(struct hdmi_eld));
+#endif
 
 	eld->monitor_present	= !!(present & AC_PINSENSE_PRESENCE);
 	if (eld->monitor_present)
-		eld->eld_valid	= !!(present & AC_PINSENSE_ELDV);
-	else
-		eld->eld_valid	= 0;
+		eld_valid	= !!(present & AC_PINSENSE_ELDV);
 
 	printk(KERN_INFO
 		"HDMI status: Codec=%d Pin=%d Presence_Detect=%d ELD_Valid=%d\n",
-		codec->addr, pin_nid, eld->monitor_present, eld->eld_valid);
+		codec->addr, pin_nid, eld->monitor_present, eld_valid);
 
-	if (eld->eld_valid)
+	if (eld_valid)
 		if (!snd_hdmi_get_eld(eld, codec, pin_nid))
 			snd_hdmi_show_eld(eld);
 


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