Messages in this thread Patch in this message | | | Date | Wed, 10 Sep 2008 13:58:26 +0200 (CEST) | From | Julia Lawall <> | Subject | [PATCH 4/4] net/9p/trans_fd.c: introduce missing kfree |
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From: Julia Lawall <julia@diku.dk>
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> --- net/9p/trans_fd.c | 4 +++- 1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c index cdf137a..8c92425 100644 --- a/net/9p/trans_fd.c +++ b/net/9p/trans_fd.c @@ -908,8 +908,10 @@ 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);
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