Commit 62067824 authored by Julia Lawall's avatar Julia Lawall Committed by Eric Van Hensbergen
Browse files

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: default avatarJulia Lawall <julia@diku.dk>
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 206ca50d
...@@ -870,8 +870,10 @@ static struct p9_req *p9_send_request(struct p9_conn *m, ...@@ -870,8 +870,10 @@ static struct p9_req *p9_send_request(struct p9_conn *m,
else else
n = p9_mux_get_tag(m); n = p9_mux_get_tag(m);
if (n < 0) if (n < 0) {
kfree(req);
return ERR_PTR(-ENOMEM); return ERR_PTR(-ENOMEM);
}
p9_set_tag(tc, n); p9_set_tag(tc, n);
......
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