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Date: Mon, 3 Aug 2009 11:09:14 +0200 (CEST) From: Julia Lawall <julia@...u.dk> To: Zhu Yi <yi.zhu@...el.com> Cc: "Chatre, Reinette" <reinette.chatre@...el.com>, "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>, "ipw3945-devel@...ts.sourceforge.net" <ipw3945-devel@...ts.sourceforge.net>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org> Subject: Re: [PATCH 6/10] drivers/net/wireless/iwlwifi: introduce missing kfree On Mon, 3 Aug 2009, Zhu Yi wrote: > On Sat, 2009-08-01 at 16:54 +0800, Julia Lawall wrote: > > From: Julia Lawall <julia@...u.dk> > > > > Error handling code following a kzalloc 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,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) > > // </smpl> > > > > Signed-off-by: Julia Lawall <julia@...u.dk> > > --- > > drivers/net/wireless/iwlwifi/iwl-debugfs.c | 1 + > > 1 files changed, 1 insertions(+), 0 deletions(-) > > > > diff --git a/drivers/net/wireless/iwlwifi/iwl-debugfs.c b/drivers/net/wireless/iwlwifi/iwl-debugfs.c > > index 7707a26..c2106d0 100644 > > --- a/drivers/net/wireless/iwlwifi/iwl-debugfs.c > > +++ b/drivers/net/wireless/iwlwifi/iwl-debugfs.c > > @@ -320,6 +320,7 @@ static ssize_t iwl_dbgfs_nvm_read(struct file *file, > > ptr = priv->eeprom; > > if (!ptr) { > > IWL_ERR(priv, "Invalid EEPROM/OTP memory\n"); > > + kfree(buf); > > return -ENOMEM; > > } > > pos += scnprintf(buf + pos, buf_size - pos, "NVM Type: %s\n", > > Probably moving !priv->eeprom check prior to buf kzalloc is better. OK, I will do that instead. julia -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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