linux-kernel - [PATCH] sound/pci/mixart/mixart.c: Add missing snd_card

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Date:	Thu, 27 Nov 2008 14:23:43 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	perex@...ex.cz, tiwai@...e.de, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] sound/pci/mixart/mixart.c: Add missing snd_card_free

From: Julia Lawall <julia@...u.dk>

The function snd_mixart_create creates a link between mgr and card that
allows snd_mixart_free to free card as well.  But if snd_mixart_create
fails, then the link has not been created and card has to be freed explicitly.


The semantic match that finds the problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@r exists@
local idexpression x;
statement S,S1;
position p1,p2,p3;
expression E,E1;
type T,T1;
expression *ptr != NULL;
@@

(
 if ((x@p1 = snd_card_new(...)) == NULL) S
|
 x@p1 = snd_card_new(...);
)
 ... when != snd_card_free(...,(T)x,...)
     when != if (...) { <+... snd_card_free(...,(T)x,...) ...+> }
     when != true x == NULL || ...
     when != x = E
     when != E = (T)x
     when any
(
 if (x == NULL || ...) S1
|
 if@p2 (...) {
  ... when != snd_card_free(...,(T1)x,...)
      when != if (...) { <+... snd_card_free(...,(T1)x,...) ...+> }
      when != x = E1
      when != E1 = (T1)x
(
  return \(0\|<+...x...+>\|ptr\);
|
  return@p3 ...;
)
}
)

@ script:python @
p1 << r.p1;
p3 << r.p3;
@@

print "* file: %s snd_card_new: %s return: %s" % (p1[0].file,p1[0].line,p3[0].line)

// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 sound/pci/mixart/mixart.c           |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/sound/pci/mixart/mixart.c b/sound/pci/mixart/mixart.c
index ae7601f..1dd90f0 100644
--- a/sound/pci/mixart/mixart.c
+++ b/sound/pci/mixart/mixart.c
@@ -1377,6 +1377,7 @@ static int __devinit snd_mixart_probe(struct pci_dev *pci,
 		sprintf(card->longname, "%s [PCM #%d]", mgr->longname, i);
 
 		if ((err = snd_mixart_create(mgr, card, i)) < 0) {
+			snd_card_free(card);
 			snd_mixart_free(mgr);
 			return err;
 		}
--
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