Hi, chunfeng yun <chunfeng.yun@xxxxxxxxxxxx> 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 ? >> Shouldn't we fix that issue instead? > I don't know which way is better, but it seems simple to fix it up in > buffer.c I think we should, really, avoid a 0-length allocation, but passing a size of 0 to testusb isn't very good either ;-) How are you calling testusb ? -- balbi
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