6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Olaf Hering <olaf@xxxxxxxxx>
[ Upstream commit 4bcda1eaf184e308f07f9c61d3a535f9ce477ce8 ]
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.
Fixes: f8b92ba67c5d ("mount: Add mount warning for impending timestamp expiry")
Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
Link: https://lore.kernel.org/r/20240730085856.32385-1-olaf@xxxxxxxxx
[brauner: rewrite commit and commit message]
Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/namespace.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/fs/namespace.c b/fs/namespace.c
index e6c61d4997ccf..b4385e2413d59 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2796,8 +2796,15 @@ static void mnt_warn_timestamp_expiry(struct path *mountpoint, struct vfsmount *
if (!__mnt_is_readonly(mnt) &&
(!(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 *buf, *mntpath;
+
+ buf = (char *)__get_free_page(GFP_KERNEL);
+ if (buf)
+ mntpath = d_path(mountpoint, buf, PAGE_SIZE);
+ else
+ mntpath = ERR_PTR(-ENOMEM);
+ if (IS_ERR(mntpath))
+ mntpath = "(unknown)";
pr_warn("%s filesystem being %s at %s supports timestamps until %ptTd (0x%llx)\n",
sb->s_type->name,
@@ -2805,8 +2812,9 @@ 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;
+ if (buf)
+ free_page((unsigned long)buf);
}
}
--
2.43.0
