From: Zhihao Cheng <chengzhihao1@xxxxxxxxxx> [ Upstream commit c2c36cc6ca23e614f9e4238d0ecf48549ee9002a ] Fix bad space budget when symlink file is encrypted. Bad space budget may let make_reservation() return with -ENOSPC, which could turn ubifs to read-only mode in do_writepage() process. Fetch a reproducer in [Link]. Link: https://bugzilla.kernel.org/show_bug.cgi?id=216490 Fixes: ca7f85be8d6cf9 ("ubifs: Add support for encrypted symlinks") Signed-off-by: Zhihao Cheng <chengzhihao1@xxxxxxxxxx> Signed-off-by: Richard Weinberger <richard@xxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- fs/ubifs/dir.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c index 111905ddbfc2e..f054c12a0f939 100644 --- a/fs/ubifs/dir.c +++ b/fs/ubifs/dir.c @@ -1141,7 +1141,6 @@ static int ubifs_symlink(struct inode *dir, struct dentry *dentry, int err, sz_change, len = strlen(symname); struct fscrypt_str disk_link; struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, - .new_ino_d = ALIGN(len, 8), .dirtied_ino = 1 }; struct fscrypt_name nm; @@ -1157,6 +1156,7 @@ static int ubifs_symlink(struct inode *dir, struct dentry *dentry, * Budget request settings: new inode, new direntry and changing parent * directory inode. */ + req.new_ino_d = ALIGN(disk_link.len - 1, 8); err = ubifs_budget_space(c, &req); if (err) return err; -- 2.39.2
