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9p: introduce missing kfree 

Error handling code following a kmalloc should free the allocated data.

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;
expression E;
identifier f,l;
position p1,p2;
expression *ptr != NULL;
@@

(
if ((x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...)) == NULL) S
|
x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...);
...
if (x == NULL) S
)
<... when != x
     when != if (...) { <+...x...+> }
x->f = E
...>
(
 return \(0\|<+...x...+>\|ptr\);
|
 return@p2 ...;
)

@script:python@
p1 << r.p1;
p2 << r.p2;
@@

print "* file: %s kmalloc %s return %s" % (p1[0].file,p1[0].line,p2[0].line)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Julia Lawall 2008-09-24 16:22:22 -05:00 committed by Eric Van Hensbergen
parent 206ca50de7
commit 620678244b
1 changed files with 3 additions and 1 deletions
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4
net/9p/trans_fd.c
View File

@ -870,8 +870,10 @@ static struct p9_req *p9_send_request(struct p9_conn *m,
else
n = p9_mux_get_tag(m);
if (n < 0)
if (n < 0) {
kfree(req);
return ERR_PTR(-ENOMEM);
}
p9_set_tag(tc, n);