diff options
| author | Kuan-Wei Chiu <visitorckw@gmail.com> | 2024-09-08 22:00:09 +0800 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2024-09-09 15:57:09 -0700 |
| commit | 4cdc0e4ce5e893bc92255f5f734d983012f2bc2e (patch) | |
| tree | 95ccd61a746435eab3bcb4ce2c320cdb9c674b64 /tools/bpf | |
| parent | 12707b9159e631af91c051fd102d469364b6ecc3 (diff) | |
bpftool: Fix undefined behavior caused by shifting into the sign bit
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@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Quentin Monnet <qmo@kernel.org>
Link: https://lore.kernel.org/bpf/20240908140009.3149781-1-visitorckw@gmail.com
Diffstat (limited to 'tools/bpf')
| -rw-r--r-- | tools/bpf/bpftool/net.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/tools/bpf/bpftool/net.c b/tools/bpf/bpftool/net.c index 2a51f1c25732..3c50fc66bb4a 100644 --- a/tools/bpf/bpftool/net.c +++ b/tools/bpf/bpftool/net.c @@ -486,9 +486,9 @@ 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(""); } @@ -497,9 +497,9 @@ 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(""); } |