6.12-stable review patch. If anyone has any objections, please let me know.
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From: Eduard Zingerman eddyz87@gmail.com
commit f3c2d243a36ef23be07bc2bce7c6a5cb6e07d9e3 upstream.
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: Greg Kroah-Hartman gregkh@linuxfoundation.org --- kernel/bpf/verifier.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
--- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -18721,8 +18721,10 @@ process_bpf_exit: 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; }