From: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
8 is not the maximum size of the suffix used when creating debugfs files.
Let the compiler compute the correct size, and only give a hint about the
longest possible string that is used.
When building with W=1, this fixes the following warnings:
fs/dlm/debug_fs.c: In function ‘dlm_create_debug_file’:
fs/dlm/debug_fs.c:1020:58: error: ‘snprintf’ output may be truncated before the last format character [-Werror=format-truncation=]
1020 | snprintf(name, DLM_LOCKSPACE_LEN + 8, "%s_waiters", ls->ls_name);
| ^
fs/dlm/debug_fs.c:1020:9: note: ‘snprintf’ output between 9 and 73 bytes into a destination of size 72
1020 | snprintf(name, DLM_LOCKSPACE_LEN + 8, "%s_waiters", ls->ls_name);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/dlm/debug_fs.c:1031:50: error: ‘_queued_asts’ directive output may be truncated writing 12 bytes into a region of size between 8 and 72 [-Werror=format-truncation=]
1031 | snprintf(name, DLM_LOCKSPACE_LEN + 8, "%s_queued_asts", ls->ls_name);
| ^~~~~~~~~~~~
fs/dlm/debug_fs.c:1031:9: note: ‘snprintf’ output between 13 and 77 bytes into a destination of size 72
1031 | snprintf(name, DLM_LOCKSPACE_LEN + 8, "%s_queued_asts", ls->ls_name);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Fixes: 541adb0d4d10b ("fs: dlm: debugfs for queued callbacks")
Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
Signed-off-by: Alexander Aring <aahringo@xxxxxxxxxx>
---
fs/dlm/debug_fs.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c
index e9726c6cbdf2..c93359ceaae6 100644
--- a/fs/dlm/debug_fs.c
+++ b/fs/dlm/debug_fs.c
@@ -973,7 +973,8 @@ void dlm_delete_debug_comms_file(void *ctx)
void dlm_create_debug_file(struct dlm_ls *ls)
{
- char name[DLM_LOCKSPACE_LEN + 8];
+ /* Reserve enough space for the longest file name */
+ char name[DLM_LOCKSPACE_LEN + sizeof("_queued_asts")];
/* format 1 */
--
2.39.3
