linux-kernel - [PATCH] SOUND: usb/endpoint, fix dangling pointer use

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Date:	Mon, 21 Jun 2010 17:03:21 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	tiwai@...e.de
Cc:	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
	jirislaby@...il.com, Daniel Mack <daniel@...aq.de>,
	Clemens Ladisch <clemens@...isch.de>
Subject: [PATCH] SOUND: usb/endpoint, fix dangling pointer use

Stanse found that in snd_usb_parse_audio_endpoints, there is a
dangling pointer dereference. When snd_usb_parse_audio_format fails,
fp is freed, and continue invoked. On the next loop, there is
"fp && fp->altsetting == 1 && fp->channels == 1" test, but fp is set
from the last iteration (but is bogus) and thus ilegally dereferenced.

Set fp to NULL before "continue".

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Cc: Daniel Mack <daniel@...aq.de>
Cc: Clemens Ladisch <clemens@...isch.de>
Cc: Takashi Iwai <tiwai@...e.de>
---
 sound/usb/endpoint.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index 9593b91..6f6596c 100644
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -427,6 +427,7 @@ int snd_usb_parse_audio_endpoints(struct snd_usb_audio *chip, int iface_no)
 		if (snd_usb_parse_audio_format(chip, fp, format, fmt, stream, alts) < 0) {
 			kfree(fp->rate_table);
 			kfree(fp);
+			fp = NULL;
 			continue;
 		}
 
-- 
1.7.1


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