On Fri, May 01, 2020 at 09:05:38AM +0200, Greg KH wrote: > On Thu, Apr 30, 2020 at 11:03:54PM -0400, Kyungtae Kim wrote: > > We report a bug (in linux-5.6.8) found by FuzzUSB (a modified version > > of syzkaller). > > > > This happened when the size of "name" buffer is smaller than that of > > "page" buffer > > (after function kstrdup executed at line 263). > > I guess it comes from the "page" buffer containing 0 value in the middle. > > So accessing the "name" buffer with "len" variable, which is used to > > indicate the size of "page" buffer, > > triggered memory access violation. > > To fix, it may need to check the size of name buffer, and try to use > > right index variable. > > Can you submit a patch for this as you have a reproducer to test the > issue? > > thanks, > > greg k-h I just submitted a patch after testing with the repro. Regards, Kyungtae
