From 024cb8a67f3d3438322fac9d6f7b1cc578eca71c Mon Sep 17 00:00:00 2001 From: Julia Lawall Date: Fri, 21 May 2010 22:26:42 +0000 Subject: drivers/isdn: Use memdup_user Use memdup_user when user data is immediately copied into the allocated region. The semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // @@ expression from,to,size,flag; position p; identifier l1,l2; @@ - to = \(kmalloc@p\|kzalloc@p\)(size,flag); + to = memdup_user(from,size); if ( - to==NULL + IS_ERR(to) || ...) { <+... when != goto l1; - -ENOMEM + PTR_ERR(to) ...+> } - if (copy_from_user(to, from, size) != 0) { - <+... when != goto l2; - -EFAULT - ...+> - } // Signed-off-by: Julia Lawall Signed-off-by: David S. Miller --- drivers/isdn/sc/ioctl.c | 23 ++++++----------------- 1 file changed, 6 insertions(+), 17 deletions(-) (limited to 'drivers/isdn/sc') diff --git a/drivers/isdn/sc/ioctl.c b/drivers/isdn/sc/ioctl.c index 1081091..43c5dc35 100644 --- a/drivers/isdn/sc/ioctl.c +++ b/drivers/isdn/sc/ioctl.c @@ -215,19 +215,13 @@ int sc_ioctl(int card, scs_ioctl *data) pr_debug("%s: DCBIOSETSPID: ioctl received\n", sc_adapter[card]->devicename); - spid = kmalloc(SCIOC_SPIDSIZE, GFP_KERNEL); - if(!spid) { - kfree(rcvmsg); - return -ENOMEM; - } - /* * Get the spid from user space */ - if (copy_from_user(spid, data->dataptr, SCIOC_SPIDSIZE)) { + spid = memdup_user(data->dataptr, SCIOC_SPIDSIZE); + if (IS_ERR(spid)) { kfree(rcvmsg); - kfree(spid); - return -EFAULT; + return PTR_ERR(spid); } pr_debug("%s: SCIOCSETSPID: setting channel %d spid to %s\n", @@ -296,18 +290,13 @@ int sc_ioctl(int card, scs_ioctl *data) pr_debug("%s: SCIOSETDN: ioctl received\n", sc_adapter[card]->devicename); - dn = kmalloc(SCIOC_DNSIZE, GFP_KERNEL); - if (!dn) { - kfree(rcvmsg); - return -ENOMEM; - } /* * Get the spid from user space */ - if (copy_from_user(dn, data->dataptr, SCIOC_DNSIZE)) { + dn = memdup_user(data->dataptr, SCIOC_DNSIZE); + if (IS_ERR(dn)) { kfree(rcvmsg); - kfree(dn); - return -EFAULT; + return PTR_ERR(dn); } pr_debug("%s: SCIOCSETDN: setting channel %d dn to %s\n", -- cgit v1.1