Hi, chunfeng yun <chunfeng....@mediatek.com> writes: >> > On Fri, 2016-04-08 at 07:07 -0700, Greg Kroah-Hartman wrote: >> >> On Fri, Apr 08, 2016 at 05:08:03PM +0800, Chunfeng Yun wrote: >> >> > NULL pointer dereferrence will happen when class driver >> >> > wants to allocate zero length buffer and pool_max[0] >> >> > can't be used, so skip reserved pool in this case. >> >> >> >> Why would a driver want to allocate a 0 length buffer? What driver does >> >> this? >> > It's misc/usbtest.c >> >> that'll do what you ask it to do with the userspace tool testusb. Are >> you trying to pass a size of 0 ? >> > No, I just ran "testusb -t10" which called test_ctrl_queue(). > In this function, sub-case 8 passed a parameter @len as 0 to > simple_alloc_urb(), and then it tried to allocate a 0-length buffer.
odd, I have never seen this problem running testusb with the same arguments. -- balbi
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