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From: Julia Lawall on 15 May 2010 17:30
From: Julia Lawall <julia(a)diku.dk>

Use kmemdup when some other buffer is immediately copied into the
allocated region.

A simplified version of the semantic patch that makes this change is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression from,to,size,flag;
statement S;
@@

- to = \(kmalloc\|kzalloc\)(size,flag);
+ to = kmemdup(from,size,flag);
if (to==NULL || ...) S
- memcpy(to, from, size);
// </smpl>

Signed-off-by: Julia Lawall <julia(a)diku.dk>

---
drivers/hid/hid-core.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff -u -p a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -653,10 +653,9 @@ int hid_parse_report(struct hid_device *
if (device->driver->report_fixup)
device->driver->report_fixup(device, start, size);

- device->rdesc = kmalloc(size, GFP_KERNEL);
+ device->rdesc = kmemdup(start, size, GFP_KERNEL);
if (device->rdesc == NULL)
return -ENOMEM;
- memcpy(device->rdesc, start, size);
device->rsize = size;

parser = vmalloc(sizeof(struct hid_parser));
--
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