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Miller" , Jakub Kicinski , Jesper Dangaard Brouer , =?UTF-8?q?Toke=20H=C3=B8iland-J=C3=B8rgensen?= , netdev@vger.kernel.org Subject: [PATCH RFC bpf-next 01/15] samples: bpf: fix a couple of NULL dereferences Date: Sat, 29 May 2021 05:22:36 +0530 Message-Id: <20210528235250.2635167-2-memxor@gmail.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210528235250.2635167-1-memxor@gmail.com> References: <20210528235250.2635167-1-memxor@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org When giving it just one ifname instead of two, it accesses argv[optind + 1], which is out of bounds (as argc < optind + 1). Signed-off-by: Kumar Kartikeya Dwivedi --- samples/bpf/xdp_redirect_map_user.c | 4 ++-- samples/bpf/xdp_redirect_user.c | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/samples/bpf/xdp_redirect_map_user.c b/samples/bpf/xdp_redirect_map_user.c index 0e8192688dfc..ad3cdc4c07d3 100644 --- a/samples/bpf/xdp_redirect_map_user.c +++ b/samples/bpf/xdp_redirect_map_user.c @@ -169,8 +169,8 @@ int main(int argc, char **argv) return 1; } - if (optind == argc) { - printf("usage: %s _IN _OUT\n", argv[0]); + if (argc <= optind + 1) { + usage(basename(argv[0])); return 1; } diff --git a/samples/bpf/xdp_redirect_user.c b/samples/bpf/xdp_redirect_user.c index 41d705c3a1f7..4e310660632b 100644 --- a/samples/bpf/xdp_redirect_user.c +++ b/samples/bpf/xdp_redirect_user.c @@ -130,8 +130,8 @@ int main(int argc, char **argv) if (!(xdp_flags & XDP_FLAGS_SKB_MODE)) xdp_flags |= XDP_FLAGS_DRV_MODE; - if (optind == argc) { - printf("usage: %s _IN _OUT\n", argv[0]); + if (argc <= optind + 1) { + usage(basename(argv[0])); return 1; } -- 2.31.1