diff options
| author | Julia Lawall <julia@diku.dk> | 2010-05-15 11:46:12 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-02 10:18:50 -0700 |
| commit | 4cccc4c16363508973bf6197cabd66291d2a3423 (patch) | |
| tree | bd8bd96882139e5a3828e8bf669ef7505920fe3b | |
| parent | 30b816a516ba96aa85ce0290aa63cebd3d258b72 (diff) | |
SCSI: aacraid: Eliminate use after free
commit 8a52da632ceb9d8b776494563df579e87b7b586b upstream.
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>
| -rw-r--r-- | drivers/scsi/aacraid/commctrl.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/scsi/aacraid/commctrl.c b/drivers/scsi/aacraid/commctrl.c index a7355260cfc..a7b7da1e72c 100644 --- a/drivers/scsi/aacraid/commctrl.c +++ b/drivers/scsi/aacraid/commctrl.c @@ -645,9 +645,9 @@ 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; } |