Re: [PATCH bpf] bpf, xdp: fix crash in xdp_umem_unaccount_pages

2018-06-07 Thread Alexei Starovoitov
On Fri, Jun 08, 2018 at 12:06:01AM +0200, Daniel Borkmann wrote: > syzkaller was able to trigger the following panic for AF_XDP: > > BUG: KASAN: null-ptr-deref in atomic64_sub > include/asm-generic/atomic-instrumented.h:144 [inline] > BUG: KASAN: null-ptr-deref in atomic_long_sub > include/a

[PATCH bpf] bpf, xdp: fix crash in xdp_umem_unaccount_pages

2018-06-07 Thread Daniel Borkmann
syzkaller was able to trigger the following panic for AF_XDP: BUG: KASAN: null-ptr-deref in atomic64_sub include/asm-generic/atomic-instrumented.h:144 [inline] BUG: KASAN: null-ptr-deref in atomic_long_sub include/asm-generic/atomic-long.h:199 [inline] BUG: KASAN: null-ptr-deref in xdp_ume