Replace shifts of '1' with '1U' in bitwise operations within
__show_dev_tc_bpf() to prevent undefined behavior caused by shifting
into the sign bit of a signed integer. By using '1U', the operations
are explicitly performed on unsigned integers, avoiding potential
integer overflow or sign-related issues.
Signed-off-by: Kuan-Wei Chiu <visitorckw@xxxxxxxxx>
---
tools/bpf/bpftool/net.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/tools/bpf/bpftool/net.c b/tools/bpf/bpftool/net.c
index 968714b4c3d4..ad2ea6cf2db1 100644
--- a/tools/bpf/bpftool/net.c
+++ b/tools/bpf/bpftool/net.c
@@ -482,9 +482,9 @@ static void __show_dev_tc_bpf(const struct ip_devname_ifindex *dev,
if (prog_flags[i] || json_output) {
NET_START_ARRAY("prog_flags", "%s ");
for (j = 0; prog_flags[i] && j < 32; j++) {
- if (!(prog_flags[i] & (1 << j)))
+ if (!(prog_flags[i] & (1U << j)))
continue;
- NET_DUMP_UINT_ONLY(1 << j);
+ NET_DUMP_UINT_ONLY(1U << j);
}
NET_END_ARRAY("");
}
@@ -493,9 +493,9 @@ static void __show_dev_tc_bpf(const struct ip_devname_ifindex *dev,
if (link_flags[i] || json_output) {
NET_START_ARRAY("link_flags", "%s ");
for (j = 0; link_flags[i] && j < 32; j++) {
- if (!(link_flags[i] & (1 << j)))
+ if (!(link_flags[i] & (1U << j)))
continue;
- NET_DUMP_UINT_ONLY(1 << j);
+ NET_DUMP_UINT_ONLY(1U << j);
}
NET_END_ARRAY("");
}
--
2.34.1
