[PATCH bpf-next] selftests/bpf: Fix segfault in bpf_tcp_ca

[Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx>]

Since commit ad9a7f96445b ("libbpf: Improve logging around BPF program
loading"), libbpf_debug_print() gets an additional prog_name parameter
but doesn't pass it to printf(). Since the format string now expects two
arguments, printf() may read uninitialized data and segfault. Pass
prog_name through.

Fixes: ad9a7f96445b ("libbpf: Improve logging around BPF program loading")
Signed-off-by: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx>
---
 tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c b/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c
index 8daca0ac909f..8f7a1cef7d87 100644
--- a/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c
@@ -217,7 +217,7 @@ static bool found;
 static int libbpf_debug_print(enum libbpf_print_level level,
 			      const char *format, va_list args)
 {
-	const char *log_buf;
+	const char *prog_name, *log_buf;
 
 	if (level != LIBBPF_WARN ||
 	    !strstr(format, "-- BEGIN PROG LOAD LOG --")) {
@@ -225,15 +225,14 @@ static int libbpf_debug_print(enum libbpf_print_level level,
 		return 0;
 	}
 
-	/* skip prog_name */
-	va_arg(args, char *);
+	prog_name = va_arg(args, char *);
 	log_buf = va_arg(args, char *);
 	if (!log_buf)
 		goto out;
 	if (err_str && strstr(log_buf, err_str) != NULL)
 		found = true;
 out:
-	printf(format, log_buf);
+	printf(format, prog_name, log_buf);
 	return 0;
 }
 
-- 
2.34.1