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@diku.dk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
73f6a12ed1