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| author | Jia-Ju Bai <baijiaju1990@gmail.com> | 2019-07-26 11:27:36 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-07-27 23:29:39 +0300 |
| commit | a0d57a552b836206ad7705a1060e6e1ce5a38203 (patch) | |
| tree | d5798f71c13150b2e8e3702434c58c936721b02a | |
| parent | 0a062ba725cdad3b167782179ee914a8402a0184 (diff) | |
| download | linux-a0d57a552b836206ad7705a1060e6e1ce5a38203.tar.xz | |
isdn: mISDN: hfcsusb: Fix possible null-pointer dereferences in start_isoc_chain()
In start_isoc_chain(), usb_alloc_urb() on line 1392 may fail
and return NULL. At this time, fifo->iso[i].urb is assigned to NULL.
Then, fifo->iso[i].urb is used at some places, such as:
LINE 1405: fill_isoc_urb(fifo->iso[i].urb, ...)
urb->number_of_packets = num_packets;
urb->transfer_flags = URB_ISO_ASAP;
urb->actual_length = 0;
urb->interval = interval;
LINE 1416: fifo->iso[i].urb->...
LINE 1419: fifo->iso[i].urb->...
Thus, possible null-pointer dereferences may occur.
To fix these bugs, "continue" is added to avoid using fifo->iso[i].urb
when it is NULL.
These bugs are found by a static analysis tool STCheck written by us.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/isdn/hardware/mISDN/hfcsusb.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/isdn/hardware/mISDN/hfcsusb.c b/drivers/isdn/hardware/mISDN/hfcsusb.c index 0e224232f746..8fb7c5dea07f 100644 --- a/drivers/isdn/hardware/mISDN/hfcsusb.c +++ b/drivers/isdn/hardware/mISDN/hfcsusb.c @@ -1394,6 +1394,7 @@ start_isoc_chain(struct usb_fifo *fifo, int num_packets_per_urb, printk(KERN_DEBUG "%s: %s: alloc urb for fifo %i failed", hw->name, __func__, fifo->fifonum); + continue; } fifo->iso[i].owner_fifo = (struct usb_fifo *) fifo; fifo->iso[i].indx = i; |