From: Wang Shilong <wshilong@xxxxxxx> U32_MAX is reserved for special purpose, qid_has_mapping() will return false if projid is 4294967295, dqget() will return NULL for it. So U32_MAX is unsupported Project ID, fix to forbid it. Signed-off-by: Wang Shilong <wshilong@xxxxxxx> --- fs/ext4/ioctl.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c index 31627f7dc5cd..f3a8d962c291 100644 --- a/fs/ext4/ioctl.c +++ b/fs/ext4/ioctl.c @@ -744,6 +744,9 @@ int ext4_fileattr_set(struct user_namespace *mnt_userns, u32 flags = fa->flags; int err = -EOPNOTSUPP; + if (fa->fsx_projid >= U32_MAX) + return -EINVAL; + ext4_fc_start_update(inode); if (flags & ~EXT4_FL_USER_VISIBLE) goto out; -- 2.27.0
