From: Andrii Nakryiko <andriin@fb.com>
Date: Thu, 7 Nov 2019 02:08:52 +0000 (-0800)
Subject: libbpf: Fix potential overflow issue
X-Git-Tag: v5.5-rc1~174^2~49^2~27^2~3
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=4ee1135615713387b869dfd099ffdf8656be6784;p=thirdparty%2Fkernel%2Flinux.git

libbpf: Fix potential overflow issue

Fix a potential overflow issue found by LGTM analysis, based on Github libbpf
source code.

Fixes: 3d65014146c6 ("bpf: libbpf: Add btf_line_info support to libbpf")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20191107020855.3834758-3-andriin@fb.com
---

diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index ca0d635b1d5ea..b3e3e99a0f280 100644
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -189,7 +189,7 @@ static void *
 alloc_zero_tailing_info(const void *orecord, __u32 cnt,
 			__u32 actual_rec_size, __u32 expected_rec_size)
 {
-	__u64 info_len = actual_rec_size * cnt;
+	__u64 info_len = (__u64)actual_rec_size * cnt;
 	void *info, *nrecord;
 	int i;