From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Fri, 13 Jul 2018 15:11:39 +0000 (+0300)
Subject: samples: bpf: ensure that we don't load over MAX_PROGS programs
X-Git-Tag: Ubuntu-5.2.0-15.16~3800^2~306^2~7
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=b0294bc1ad19e9d2dd03df5faa1ccc395d4ddd4b;p=mirror_ubuntu-eoan-kernel.git

samples: bpf: ensure that we don't load over MAX_PROGS programs

I can't see that we check prog_cnt to ensure it doesn't go over
MAX_PROGS.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
---

diff --git a/samples/bpf/bpf_load.c b/samples/bpf/bpf_load.c
index 89161c9ed466..904e775d1a44 100644
--- a/samples/bpf/bpf_load.c
+++ b/samples/bpf/bpf_load.c
@@ -107,6 +107,9 @@ static int load_and_attach(const char *event, struct bpf_insn *prog, int size)
 		return -1;
 	}
 
+	if (prog_cnt == MAX_PROGS)
+		return -1;
+
 	fd = bpf_load_program(prog_type, prog, insns_cnt, license, kern_version,
 			      bpf_log_buf, BPF_LOG_BUF_SIZE);
 	if (fd < 0) {