From 5426700e6841bf72e652e34b5cec68eadf442435 Mon Sep 17 00:00:00 2001 From: Kui-Feng Lee Date: Thu, 3 Aug 2023 16:12:06 -0700 Subject: bpf: fix bpf_dynptr_slice() to stop return an ERR_PTR. Verify if the pointer obtained from bpf_xdp_pointer() is either an error or NULL before returning it. The function bpf_dynptr_slice() mistakenly returned an ERR_PTR. Instead of solely checking for NULL, it should also verify if the pointer returned by bpf_xdp_pointer() is an error or NULL. Reported-by: Dan Carpenter Closes: https://lore.kernel.org/bpf/d1360219-85c3-4a03-9449-253ea905f9d1@moroto.mountain/ Fixes: 66e3a13e7c2c ("bpf: Add bpf_dynptr_slice and bpf_dynptr_slice_rdwr") Suggested-by: Alexei Starovoitov Signed-off-by: Kui-Feng Lee Acked-by: Yonghong Song Link: https://lore.kernel.org/r/20230803231206.1060485-1-thinker.li@gmail.com Signed-off-by: Martin KaFai Lau --- kernel/bpf/helpers.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'kernel') diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c index 56ce5008aedd..eb91cae0612a 100644 --- a/kernel/bpf/helpers.c +++ b/kernel/bpf/helpers.c @@ -2270,7 +2270,7 @@ __bpf_kfunc void *bpf_dynptr_slice(const struct bpf_dynptr_kern *ptr, u32 offset case BPF_DYNPTR_TYPE_XDP: { void *xdp_ptr = bpf_xdp_pointer(ptr->data, ptr->offset + offset, len); - if (xdp_ptr) + if (!IS_ERR_OR_NULL(xdp_ptr)) return xdp_ptr; if (!buffer__opt) -- cgit v1.2.3