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HID: picolcd: Eliminate use after free 

The skip label frees resp, which has not been allocated at the point of
this goto and then does a break, based on the fact that err is non-zero.
This is replaced by a break directly.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@free@
expression E;
position p;
@@
kfree@p(E)

@@
expression free.E, subE<=free.E, E1;
position free.p;
@@

  kfree@p(E)
  ...
(
  subE = E1
|
* E
)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Julia Lawall 2010-05-15 11:46:36 +02:00 committed by Jiri Kosina
parent 9d71ea057b
commit aeacb6fd30
1 changed files with 1 additions and 1 deletions
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2
drivers/hid/hid-picolcd.c
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@ -1616,7 +1616,7 @@ static ssize_t _picolcd_flash_write(struct picolcd_data *data, int report_id,
raw_data[len_off] = s > 32 ? 32 : s;
if (copy_from_user(raw_data+len_off+1, u, raw_data[len_off])) {
err = -EFAULT;
goto skip;
break;
}
resp = picolcd_send_and_wait(data->hdev, report_id, raw_data,
len_off+1+raw_data[len_off]);