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bpftool: Fix undefined behavior caused by shifting into the sign bit

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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
This commit is contained in:
Kuan-Wei Chiu
2024-09-08 22:00:09 +08:00
committed by Andrii Nakryiko
parent 12707b9159
commit 4cdc0e4ce5
1 changed files with 4 additions and 4 deletions
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8
tools/bpf/bpftool/net.c
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@@ -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("");
}