From: Eduard Zingerman eddyz87@gmail.com
[ Upstream commit f3c2d243a36ef23be07bc2bce7c6a5cb6e07d9e3 ]
In addition to warning abort verification with -EFAULT. If env->cur_state->loop_entry != NULL something is irrecoverably buggy.
Fixes: bbbc02b7445e ("bpf: copy_verifier_state() should copy 'loop_entry' field") Suggested-by: Andrii Nakryiko andrii.nakryiko@gmail.com Signed-off-by: Eduard Zingerman eddyz87@gmail.com Acked-by: Andrii Nakryiko andrii@kernel.org Link: https://lore.kernel.org/r/20250225003838.135319-1-eddyz87@gmail.com Signed-off-by: Alexei Starovoitov ast@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/bpf/verifier.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 4392436ba7511..1841467c4f2e5 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -19265,8 +19265,10 @@ static int do_check(struct bpf_verifier_env *env) return err; break; } else { - if (WARN_ON_ONCE(env->cur_state->loop_entry)) - env->cur_state->loop_entry = NULL; + if (WARN_ON_ONCE(env->cur_state->loop_entry)) { + verbose(env, "verifier bug: env->cur_state->loop_entry != NULL\n"); + return -EFAULT; + } do_print_state = true; continue; }