redonkable
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alistair23-linux
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[SCSI] aacraid: Eliminate use after free 

The debugging code using the freed structure is moved before the kfree.

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: James Bottomley <James.Bottomley@suse.de>
hifive-unleashed-5.1
Julia Lawall 2010-05-15 11:46:12 +02:00 committed by James Bottomley
parent 36b83ded06
commit 8a52da632c
1 changed files with 2 additions and 2 deletions
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4
drivers/scsi/aacraid/commctrl.c
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@ -655,9 +655,9 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
/* Does this really need to be GFP_DMA? */
p = kmalloc(usg->sg[i].count,GFP_KERNEL|__GFP_DMA);
if(!p) {
kfree (usg);
dprintk((KERN_DEBUG"aacraid: Could not allocate SG buffer - size = %d buffer number %d of %d\n",
dprintk((KERN_DEBUG "aacraid: Could not allocate SG buffer - size = %d buffer number %d of %d\n",
usg->sg[i].count,i,usg->count));
kfree(usg);
rcode = -ENOMEM;
goto cleanup;
}