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authorJulia Lawall <julia@diku.dk>2010-05-22 00:26:42 +0200
committerDavid S. Miller <davem@davemloft.net>2010-05-31 09:24:15 +0200
commit024cb8a67f3d3438322fac9d6f7b1cc578eca71c (patch)
tree23ba9dc417ae6a62aa3c9bbc2b07b0571ef28b6f /drivers/isdn/pcbit
parentdrivers/net/wan: Use memdup_user (diff)
downloadlinux-024cb8a67f3d3438322fac9d6f7b1cc578eca71c.tar.xz
linux-024cb8a67f3d3438322fac9d6f7b1cc578eca71c.zip
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/) // <smpl> @@ 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 - ...+> - } // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/isdn/pcbit')
-rw-r--r--drivers/isdn/pcbit/drv.c10
1 files changed, 3 insertions, 7 deletions
diff --git a/drivers/isdn/pcbit/drv.c b/drivers/isdn/pcbit/drv.c
index 123c1d6c43b4..1507d2e83fbb 100644
--- a/drivers/isdn/pcbit/drv.c
+++ b/drivers/isdn/pcbit/drv.c
@@ -411,14 +411,10 @@ static int pcbit_writecmd(const u_char __user *buf, int len, int driver, int cha
return -EINVAL;
}
- cbuf = kmalloc(len, GFP_KERNEL);
- if (!cbuf)
- return -ENOMEM;
+ cbuf = memdup_user(buf, len);
+ if (IS_ERR(cbuf))
+ return PTR_ERR(cbuf);
- if (copy_from_user(cbuf, buf, len)) {
- kfree(cbuf);
- return -EFAULT;
- }
memcpy_toio(dev->sh_mem, cbuf, len);
kfree(cbuf);
return len;