[Buildroot] [PATCH v1] support/kconfig: fix compiler warnings

[Thomas Devoogdt]

From: Devreese Jorik <jorik.devreese at barco.com>

Commit 324612d68e09d0db44c51c451bc6b87466f7f874 fixed several compiler warnings,
but actually introduced a new one by increasing the buffer size in confdata.c that gets passed
along to file_write_dep in util.c, because buf2's size wasn't increased along with it.

./util.c: In function ‘file_write_dep’:
./util.c:86:26: warning: ‘%s’ directive writing 10 or more bytes into a region of size between 1 and 4097 [-Wformat-overflow=]
   86 |         sprintf(buf2, "%s%s", dir, name);
      |                          ^~
./util.c:86:9: note: ‘sprintf’ output 11 or more bytes (assuming 4107) into a destination of size 4097
   86 |         sprintf(buf2, "%s%s", dir, name);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Fix this by increasing the size of buf2 to match the passed buffer size.

Signed-off-by: Devreese Jorik <jorik.devreese at barco.com>
Signed-off-by: Thomas Devoogdt <thomas.devoogdt at barco.com>
---
 support/kconfig/util.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/support/kconfig/util.c b/support/kconfig/util.c
index 8665f5bb89f..c2e7979ac15 100644
--- a/support/kconfig/util.c
+++ b/support/kconfig/util.c
@@ -35,7 +35,7 @@ struct file *file_lookup(const char *name)
 int file_write_dep(const char *name)
 {
 	char *str;
-	char buf[PATH_MAX+20], buf2[PATH_MAX+1], dir[PATH_MAX+1];
+	char buf[PATH_MAX+20], buf2[PATH_MAX+20], dir[PATH_MAX+1];
 	struct symbol *sym, *env_sym;
 	struct expr *e;
 	struct file *file;
-- 
2.43.0