From: Dmitry Safonov <0x7f454c46@gmail.com>

On my new laptop with packages from nixos-unstable, gcc 12.3.0 produces:
> lib/proc.c: In function ‘netstat_read_type’:
> lib/proc.c:89:9: error: format not a string literal and no format arguments [-Werror=format-security]
>    89 |         if (fscanf(fnetstat, type->header_name) == EOF)
>       |         ^~
> cc1: some warnings being treated as errors

Here the selftests lib parses header name, while expectes non-space word
ending with a column.

Fixes: cfbab37b3da0 ("selftests/net: Add TCP-AO library")
Signed-off-by: Dmitry Safonov <0x7f454c46@gmail.com>
---
 tools/testing/selftests/net/tcp_ao/lib/proc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/net/tcp_ao/lib/proc.c b/tools/testing/selftests/net/tcp_ao/lib/proc.c
index 2fb6dd8adba6..8b984fa04286 100644
--- a/tools/testing/selftests/net/tcp_ao/lib/proc.c
+++ b/tools/testing/selftests/net/tcp_ao/lib/proc.c
@@ -86,7 +86,7 @@ static void netstat_read_type(FILE *fnetstat, struct netstat **dest, char *line)
 
 	pos = strchr(line, ' ') + 1;
 
-	if (fscanf(fnetstat, type->header_name) == EOF)
+	if (fscanf(fnetstat, "%[^ :]", type->header_name) == EOF)
 		test_error("fscanf(%s)", type->header_name);
 	if (fread(&tmp, 1, 1, fnetstat) != 1 || tmp != ':')
 		test_error("Unexpected netstat format (%c)", tmp);

-- 
2.42.0

On Sat, 13 Apr 2024 at 02:43, Dmitry Safonov via B4 Relay
<devnull+0x7f454c46.gmail.com@kernel.org> wrote:
>
> From: Dmitry Safonov <0x7f454c46@gmail.com>
>
> On my new laptop with packages from nixos-unstable, gcc 12.3.0 produces:
> > lib/proc.c: In function ‘netstat_read_type’:
> > lib/proc.c:89:9: error: format not a string literal and no format arguments [-Werror=format-security]
> >    89 |         if (fscanf(fnetstat, type->header_name) == EOF)
> >       |         ^~
> > cc1: some warnings being treated as errors
>
> Here the selftests lib parses header name, while expectes non-space word
> ending with a column.
>
> Fixes: cfbab37b3da0 ("selftests/net: Add TCP-AO library")
> Signed-off-by: Dmitry Safonov <0x7f454c46@gmail.com>

Actually, now I see that it was also reported, adding

Reported-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
Link: https://lore.kernel.org/all/0c6d4f0d-2064-4444-986b-1d1ed782135f@collabora.com/

-- 
             Dmitry