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| author | Julia Lawall <julia@diku.dk> | 2010-05-27 18:10:08 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-10 14:35:34 -0700 |
| commit | dc6eb27bdd3d214568f7d77a317c202c10222511 (patch) | |
| tree | 81583901b296bb8ddc3327a5b2a8c2842977d6bb /drivers/usb/host/whci/qset.c | |
| parent | 6e1c3b467ffd9d6eb725dda544f6fd10e471ea71 (diff) | |
| download | lwn-dc6eb27bdd3d214568f7d77a317c202c10222511.tar.gz lwn-dc6eb27bdd3d214568f7d77a317c202c10222511.zip | |
USB: host: Eliminate NULL dereference
The test above allows std to be NULL, so check that std is not NULL before
doing the dereference.
A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)
// <smpl>
@r exists@
expression E,E1;
identifier f;
statement S1,S2,S3;
@@
if ((E == NULL && ...) || ...)
{
... when != if (...) S1 else S2
when != E = E1
* E->f
... when any
}
else S3
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host/whci/qset.c')
| -rw-r--r-- | drivers/usb/host/whci/qset.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/host/whci/qset.c b/drivers/usb/host/whci/qset.c index ab5a14fbfeeb..dc0ab8382f5d 100644 --- a/drivers/usb/host/whci/qset.c +++ b/drivers/usb/host/whci/qset.c @@ -475,7 +475,7 @@ static int qset_add_urb_sg(struct whc *whc, struct whc_qset *qset, struct urb *u || (prev_end & (WHCI_PAGE_SIZE-1)) || (dma_addr & (WHCI_PAGE_SIZE-1)) || std->len + WHCI_PAGE_SIZE > QTD_MAX_XFER_SIZE) { - if (std->len % qset->max_packet != 0) + if (std && std->len % qset->max_packet != 0) return -EINVAL; std = qset_new_std(whc, qset, urb, mem_flags); if (std == NULL) { |