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| author | Julia Lawall <julia@diku.dk> | 2008-05-12 15:38:26 +0200 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2008-05-22 06:26:28 -0400 |
| commit | 4ecc8c066f3cecb55807644a01435084d8ed638a (patch) | |
| tree | 168e13ed10241f868ee52d07d0a9731a5e2a2e54 /drivers/net/fs_enet/fs_enet-main.c | |
| parent | 0b5923cd477674755dde670ba804649523f27c97 (diff) | |
| download | linux-4ecc8c066f3cecb55807644a01435084d8ed638a.tar.gz linux-4ecc8c066f3cecb55807644a01435084d8ed638a.tar.bz2 linux-4ecc8c066f3cecb55807644a01435084d8ed638a.zip | |
drivers/net/fs_enet: remove null pointer dereference
The following code appears in the function fs_init_instance in the file drivers/net/fs_enet/fs_enet-main.c.
if (fep->ops == NULL) {
printk(KERN_ERR DRV_MODULE_NAME
": %s No matching ops found (%d).\n",
ndev->name, fpi->fs_no);
err = -EINVAL;
goto err;
}
This code implies that at the point of err, fep->ops can be NULL, so an
extra test is needed before dereferencing this value.
This problem was found using the following semantic match
(http://www.emn.fr/x-info/coccinelle/)
// <smpl>
@@
expression E, E1;
identifier f;
statement S1,S2,S3;
@@
* if (E == NULL)
{
... when != if (E == NULL) S1 else S2
when != E = E1
* E->f
... when any
return ...;
}
else S3
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/net/fs_enet/fs_enet-main.c')
| -rw-r--r-- | drivers/net/fs_enet/fs_enet-main.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/fs_enet/fs_enet-main.c b/drivers/net/fs_enet/fs_enet-main.c index 67b4b0728fce..a5baaf59ff66 100644 --- a/drivers/net/fs_enet/fs_enet-main.c +++ b/drivers/net/fs_enet/fs_enet-main.c @@ -1093,7 +1093,7 @@ err: if (registered) unregister_netdev(ndev); - if (fep != NULL) { + if (fep && fep->ops) { (*fep->ops->free_bd)(ndev); (*fep->ops->cleanup_data)(ndev); } |