From 966a5d1b85c45f1b55abbc1b595e0b5ca14b87db Mon Sep 17 00:00:00 2001 From: Julia Lawall Date: Fri, 11 Sep 2009 06:21:51 +0000 Subject: drivers/net/wan: 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/) // @r exists@ local idexpression x; statement S; expression E; identifier f,f1,l; position p1,p2; expression *ptr != NULL; @@ x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...); ... if (x == NULL) S <... when != x when != if (...) { <+...x...+> } ( x->f1 = E | (x->f1 == NULL || ...) | f(...,x->f1,...) ) ...> ( 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) // Signed-off-by: Julia Lawall Signed-off-by: David S. Miller --- drivers/net/wan/hdlc_ppp.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/wan/hdlc_ppp.c b/drivers/net/wan/hdlc_ppp.c index 72a7cdab424..b9b9d6b01c0 100644 --- a/drivers/net/wan/hdlc_ppp.c +++ b/drivers/net/wan/hdlc_ppp.c @@ -389,6 +389,7 @@ static void ppp_cp_parse_cr(struct net_device *dev, u16 pid, u8 id, for (opt = data; len; len -= opt[1], opt += opt[1]) { if (len < 2 || len < opt[1]) { dev->stats.rx_errors++; + kfree(out); return; /* bad packet, drop silently */ } -- cgit v1.2.3