From: Hao Luo haoluo@google.com
commit cf9f2f8d62eca810afbd1ee6cc0800202b000e57 upstream.
Remove PTR_TO_MEM_OR_NULL and replace it with PTR_TO_MEM combined with flag PTR_MAYBE_NULL.
Signed-off-by: Hao Luo haoluo@google.com Signed-off-by: Alexei Starovoitov ast@kernel.org Link: https://lore.kernel.org/bpf/20211217003152.48334-7-haoluo@google.com Cc: stable@vger.kernel.org # 5.16.x Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- include/linux/bpf.h | 1 - kernel/bpf/btf.c | 2 +- kernel/bpf/verifier.c | 2 +- 3 files changed, 2 insertions(+), 3 deletions(-)
--- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -506,7 +506,6 @@ enum bpf_reg_type { PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCK_COMMON, PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | PTR_TO_TCP_SOCK, PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | PTR_TO_BTF_ID, - PTR_TO_MEM_OR_NULL = PTR_MAYBE_NULL | PTR_TO_MEM,
/* This must be the last entry. Its purpose is to ensure the enum is * wide enough to hold the higher bits reserved for bpf_type_flag. --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -5847,7 +5847,7 @@ int btf_prepare_func_args(struct bpf_ver return -EINVAL; }
- reg->type = PTR_TO_MEM_OR_NULL; + reg->type = PTR_TO_MEM | PTR_MAYBE_NULL; reg->id = ++env->id_gen;
continue; --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -13336,7 +13336,7 @@ static int do_check_common(struct bpf_ve mark_reg_known_zero(env, regs, i); else if (regs[i].type == SCALAR_VALUE) mark_reg_unknown(env, regs, i); - else if (regs[i].type == PTR_TO_MEM_OR_NULL) { + else if (base_type(regs[i].type) == PTR_TO_MEM) { const u32 mem_size = regs[i].mem_size;
mark_reg_known_zero(env, regs, i);