tree 0e3289384ee6ad1a13499afe74509574be73f27c
parent 05d57f1793fb250c85028c9952c3720010baa853
author Alexei Starovoitov <ast@kernel.org> 1579660898 -0800
committer Daniel Borkmann <daniel@iogearbox.net> 1579691342 +0100

bpf: Fix error path under memory pressure

Restore the 'if (env->cur_state)' check that was incorrectly removed during
code move. Under memory pressure env->cur_state can be freed and zeroed inside
do_check(). Hence the check is necessary.

Fixes: 51c39bb1d5d1 ("bpf: Introduce function-by-function verification")
Reported-by: syzbot+b296579ba5015704d9fa@syzkaller.appspotmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20200122024138.3385590-1-ast@kernel.org