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| author | Daniel T. Lee <danieltimlee@gmail.com> | 2022-12-18 15:14:53 +0900 |
|---|---|---|
| committer | Martin KaFai Lau <martin.lau@kernel.org> | 2022-12-19 14:21:05 -0800 |
| commit | 68be98e0f4191abc64c871e3e461f275715eaf67 (patch) | |
| tree | 6fcebd2b0a0d50eab3042f2417678ca80303c1e5 /samples | |
| parent | 71135b77aac75769f6dae81ac4725405f1015d22 (diff) | |
samples/bpf: fix uninitialized warning with test_current_task_under_cgroup
Currently, compiling samples/bpf with LLVM warns about the uninitialized
use of variable with test_current_task_under_cgroup.
./samples/bpf/test_current_task_under_cgroup_user.c:57:6:
warning: variable 'cg2' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
if (setup_cgroup_environment())
^~~~~~~~~~~~~~~~~~~~~~~~~~
./samples/bpf/test_current_task_under_cgroup_user.c:106:8:
note: uninitialized use occurs here
close(cg2);
^~~
./samples/bpf/test_current_task_under_cgroup_user.c:57:2:
note: remove the 'if' if its condition is always false
if (setup_cgroup_environment())
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
./samples/bpf/test_current_task_under_cgroup_user.c:19:9:
note: initialize the variable 'cg2' to silence this warning
int cg2, idx = 0, rc = 1;
^
= 0
1 warning generated.
This commit resolve this compiler warning by pre-initialize the variable
with error for safeguard.
Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/r/20221218061453.6287-4-danieltimlee@gmail.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Diffstat (limited to 'samples')
| -rw-r--r-- | samples/bpf/test_current_task_under_cgroup_user.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/samples/bpf/test_current_task_under_cgroup_user.c b/samples/bpf/test_current_task_under_cgroup_user.c index ac251a417f45..6fb25906835e 100644 --- a/samples/bpf/test_current_task_under_cgroup_user.c +++ b/samples/bpf/test_current_task_under_cgroup_user.c @@ -14,9 +14,9 @@ int main(int argc, char **argv) { pid_t remote_pid, local_pid = getpid(); + int cg2 = -1, idx = 0, rc = 1; struct bpf_link *link = NULL; struct bpf_program *prog; - int cg2, idx = 0, rc = 1; struct bpf_object *obj; char filename[256]; int map_fd[2]; @@ -103,7 +103,9 @@ int main(int argc, char **argv) rc = 0; err: - close(cg2); + if (cg2 != -1) + close(cg2); + cleanup_cgroup_environment(); cleanup: |