If no page could be allocated, an error pointer was used as format
string in pr_warn.
Rearrange the code to return early in case of OOM. Also add a check
for the return value of d_path. The API of that function is not
documented. It currently returns only ERR_PTR values, but may return
also NULL in the future. Use PTR_ERR_OR_ZERO to cover both cases.
Fixes: f8b92ba67c5d ("mount: Add mount warning for impending timestamp expiry")
Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
---
fs/namespace.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/fs/namespace.c b/fs/namespace.c
index 328087a4df8a..539d4f203a20 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2922,7 +2922,14 @@ static void mnt_warn_timestamp_expiry(struct path *mountpoint, struct vfsmount *
(!(sb->s_iflags & SB_I_TS_EXPIRY_WARNED)) &&
(ktime_get_real_seconds() + TIME_UPTIME_SEC_MAX > sb->s_time_max)) {
char *buf = (char *)__get_free_page(GFP_KERNEL);
- char *mntpath = buf ? d_path(mountpoint, buf, PAGE_SIZE) : ERR_PTR(-ENOMEM);
+ char *mntpath;
+
+ if (!buf)
+ return;
+
+ mntpath = d_path(mountpoint, buf, PAGE_SIZE);
+ if (PTR_ERR_OR_ZERO(mntpath))
+ goto err;
pr_warn("%s filesystem being %s at %s supports timestamps until %ptTd (0x%llx)\n",
sb->s_type->name,
@@ -2930,8 +2937,9 @@ static void mnt_warn_timestamp_expiry(struct path *mountpoint, struct vfsmount *
mntpath, &sb->s_time_max,
(unsigned long long)sb->s_time_max);
- free_page((unsigned long)buf);
sb->s_iflags |= SB_I_TS_EXPIRY_WARNED;
+err:
+ free_page((unsigned long)buf);
}
}
