[v3] ALSA: hiface: fix multiple memory leak bugs
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Message ID 1565168932-6337-1-git-send-email-wenwen@cs.uga.edu
State New
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Series
  • [v3] ALSA: hiface: fix multiple memory leak bugs
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Commit Message

Wenwen Wang Aug. 7, 2019, 9:08 a.m. UTC
In hiface_pcm_init(), 'rt' is firstly allocated through kzalloc(). Later
on, hiface_pcm_init_urb() is invoked to initialize 'rt->out_urbs[i]'. In
hiface_pcm_init_urb(), 'rt->out_urbs[i].buffer' is allocated through
kzalloc().  However, if hiface_pcm_init_urb() fails, both 'rt' and
'rt->out_urbs[i].buffer' are not deallocated, leading to memory leak bugs.
Also, 'rt->out_urbs[i].buffer' is not deallocated if snd_pcm_new() fails.

To fix the above issues, free 'rt' and 'rt->out_urbs[i].buffer'.

Signed-off-by: Wenwen Wang <wenwen@cs.uga.edu>
---
 sound/usb/hiface/pcm.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

Comments

Takashi Iwai Aug. 7, 2019, 10:21 a.m. UTC | #1
On Wed, 07 Aug 2019 11:08:51 +0200,
Wenwen Wang wrote:
> 
> In hiface_pcm_init(), 'rt' is firstly allocated through kzalloc(). Later
> on, hiface_pcm_init_urb() is invoked to initialize 'rt->out_urbs[i]'. In
> hiface_pcm_init_urb(), 'rt->out_urbs[i].buffer' is allocated through
> kzalloc().  However, if hiface_pcm_init_urb() fails, both 'rt' and
> 'rt->out_urbs[i].buffer' are not deallocated, leading to memory leak bugs.
> Also, 'rt->out_urbs[i].buffer' is not deallocated if snd_pcm_new() fails.
> 
> To fix the above issues, free 'rt' and 'rt->out_urbs[i].buffer'.
> 
> Signed-off-by: Wenwen Wang <wenwen@cs.uga.edu>

Applied now.  Thanks!


Takashi

Patch
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diff --git a/sound/usb/hiface/pcm.c b/sound/usb/hiface/pcm.c
index 14fc1e1..c406497 100644
--- a/sound/usb/hiface/pcm.c
+++ b/sound/usb/hiface/pcm.c
@@ -600,14 +600,13 @@  int hiface_pcm_init(struct hiface_chip *chip, u8 extra_freq)
 		ret = hiface_pcm_init_urb(&rt->out_urbs[i], chip, OUT_EP,
 				    hiface_pcm_out_urb_handler);
 		if (ret < 0)
-			return ret;
+			goto error;
 	}
 
 	ret = snd_pcm_new(chip->card, "USB-SPDIF Audio", 0, 1, 0, &pcm);
 	if (ret < 0) {
-		kfree(rt);
 		dev_err(&chip->dev->dev, "Cannot create pcm instance\n");
-		return ret;
+		goto error;
 	}
 
 	pcm->private_data = rt;
@@ -620,4 +619,10 @@  int hiface_pcm_init(struct hiface_chip *chip, u8 extra_freq)
 
 	chip->pcm = rt;
 	return 0;
+
+error:
+	for (i = 0; i < PCM_N_URBS; i++)
+		kfree(rt->out_urbs[i].buffer);
+	kfree(rt);
+	return ret;
 }