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author | Jia-Ju Bai <baijiaju1990@gmail.com> | 2019-07-26 16:27:36 +0800 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-08-29 08:30:07 +0200 |
commit | 45d6a121c7dce4b0e472310481967b4b5001028f (patch) | |
tree | ba3006eadd54053ff93bf4ca342d9e748a6dcf2f | |
parent | c60f443cf03902a86de6fcc0d231bcd78f2f4851 (diff) | |
download | linux-stable-45d6a121c7dce4b0e472310481967b4b5001028f.tar.gz linux-stable-45d6a121c7dce4b0e472310481967b4b5001028f.tar.bz2 linux-stable-45d6a121c7dce4b0e472310481967b4b5001028f.zip |
isdn: mISDN: hfcsusb: Fix possible null-pointer dereferences in start_isoc_chain()
[ Upstream commit a0d57a552b836206ad7705a1060e6e1ce5a38203 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
-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; |