It becomes a path component, so it shouldn't exceed NAME_MAX
characters. This was hardened in commit c152737be22b ("ceph: Use
strscpy() instead of strcpy() in __get_snap_name()"), but no actual
check was put in place.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxx>
---
fs/ceph/super.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index cfe21f320f4a..f86fc5fb858a 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -431,6 +431,8 @@ static int ceph_parse_mount_param(struct fs_context *fc,
switch (token) {
case Opt_snapdirname:
+ if (strlen(param->string) > NAME_MAX)
+ return invalfc(fc, "snapdirname too long");
kfree(fsopt->snapdir_name);
fsopt->snapdir_name = param->string;
param->string = NULL;
--
2.46.1
