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tracing/probes: Avoid using params uninitialized in parse_btf_arg()

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After a recent change in clang to strengthen uninitialized warnings [1],
it points out that in one of the error paths in parse_btf_arg(), params
is used uninitialized:

  kernel/trace/trace_probe.c:660:19: warning: variable 'params' is uninitialized when used here [-Wuninitialized]
    660 |                         return PTR_ERR(params);
        |                                        ^~~~~~

Match many other NO_BTF_ENTRY error cases and return -ENOENT, clearing
up the warning.

Link: https://lore.kernel.org/all/20250715-trace_probe-fix-const-uninit-warning-v1-1-98960f91dd04@kernel.org/

Cc: stable@vger.kernel.org
Closes: https://github.com/ClangBuiltLinux/linux/issues/2110
Fixes: d157d76944 ("tracing/probes: Support BTF field access from $retval")
Link: 2464313eef [1]
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
This commit is contained in:
Nathan Chancellor 2025-07-15 20:19:44 -07:00 committed by Masami Hiramatsu (Google)
parent 347e9f5043
commit 1ed171a3af
1 changed files with 1 additions and 1 deletions
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2
kernel/trace/trace_probe.c
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@ -657,7 +657,7 @@ static int parse_btf_arg(char *varname,
ret = query_btf_context(ctx);
if (ret < 0 || ctx->nr_params == 0) {
trace_probe_log_err(ctx->offset, NO_BTF_ENTRY);
return PTR_ERR(params);
return -ENOENT;
}
}
params = ctx->params;