staging: erofs: fix fast symlink w/o xattr when fs xattr is on

commit 7077fff upstream.

Currently, this will hit a BUG_ON for these symlinks as follows:

- kernel message
------------[ cut here ]------------
kernel BUG at drivers/staging/erofs/xattr.c:59!
SMP PTI
CPU: 1 PID: 1170 Comm: getllxattr Not tainted 4.20.0-rc6+ torvalds#92
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-2.fc27 04/01/2014
RIP: 0010:init_inode_xattrs+0x22b/0x270
Code: 48 0f 45 ea f0 ff 4d 34 74 0d 41 83 4c 24 e0 01 31 c0 e9 00 fe ff ff 48 89 ef e8 e0 31 9e ff eb e9 89 e8 e9 ef fd ff ff 0f 0$
 <0f> 0b 48 89 ef e8 fb f6 9c ff 48 8b 45 08 a8 01 75 24 f0 ff 4d 34
RSP: 0018:ffffa03ac026bdf8 EFLAGS: 00010246
------------[ cut here ]------------
...
Call Trace:
 erofs_listxattr+0x30/0x2c0
 ? selinux_inode_listxattr+0x5a/0x80
 ? kmem_cache_alloc+0x33/0x170
 ? security_inode_listxattr+0x27/0x40
 listxattr+0xaf/0xc0
 path_listxattr+0x5a/0xa0
 do_syscall_64+0x43/0xf0
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
...
---[ end trace 3c24b49408dc0c72 ]---

Fix it by checking ->xattr_isize in init_inode_xattrs(),
and it also fixes improper return value -ENOTSUPP
(it should be -ENODATA if xattr is enabled) for those inodes.

Fixes: b17500a ("staging: erofs: introduce xattr & acl support")
Cc: <[email protected]> # 4.19+
Reported-by: Li Guifu <[email protected]>
Tested-by: Li Guifu <[email protected]>
Reviewed-by: Chao Yu <[email protected]>
Signed-off-by: Gao Xiang <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

drivers/staging/erofs/inode.c

@@ -184,16 +184,16 @@ static int fill_inode(struct inode *inode, int isdir)
  /* setup the new inode */
  if (S_ISREG(inode->i_mode)) {
 #ifdef CONFIG_EROFS_FS_XATTR
- if (vi->xattr_isize)
- inode->i_op = &erofs_generic_xattr_iops;
+ inode->i_op = &erofs_generic_xattr_iops;
 #endif
  inode->i_fop = &generic_ro_fops;
  } else if (S_ISDIR(inode->i_mode)) {
  inode->i_op =
 #ifdef CONFIG_EROFS_FS_XATTR
- vi->xattr_isize ? &erofs_dir_xattr_iops :
-#endif
+ &erofs_dir_xattr_iops;
+#else
  &erofs_dir_iops;
+#endif
  inode->i_fop = &erofs_dir_fops;
  } else if (S_ISLNK(inode->i_mode)) {
  /* by default, page_get_link is used for symlink */

drivers/staging/erofs/xattr.c

@@ -55,7 +55,26 @@ static int init_inode_xattrs(struct inode *inode)
  return 0;
 
  vi = EROFS_V(inode);
- BUG_ON(!vi->xattr_isize);
+
+ /*
+ * bypass all xattr operations if ->xattr_isize is not greater than
+ * sizeof(struct erofs_xattr_ibody_header), in detail:
+ * 1) it is not enough to contain erofs_xattr_ibody_header then
+ * ->xattr_isize should be 0 (it means no xattr);
+ * 2) it is just to contain erofs_xattr_ibody_header, which is on-disk
+ * undefined right now (maybe use later with some new sb feature).
+ */
+ if (vi->xattr_isize == sizeof(struct erofs_xattr_ibody_header)) {
+ errln("xattr_isize %d of nid %llu is not supported yet",
+ vi->xattr_isize, vi->nid);
+ return -ENOTSUPP;
+ } else if (vi->xattr_isize < sizeof(struct erofs_xattr_ibody_header)) {
+ if (unlikely(vi->xattr_isize)) {
+ DBG_BUGON(1);
+ return -EIO; /* xattr ondisk layout error */
+ }
+ return -ENOATTR;
+ }
 
  sbi = EROFS_I_SB(inode);
  it.blkaddr = erofs_blknr(iloc(sbi, vi->nid) + vi->inode_isize);
@@ -414,7 +433,6 @@ static int erofs_xattr_generic_get(const struct xattr_handler *handler,
  struct dentry *unused, struct inode *inode,
  const char *name, void *buffer, size_t size)
 {
- struct erofs_vnode *const vi = EROFS_V(inode);
  struct erofs_sb_info *const sbi = EROFS_I_SB(inode);
 
  switch (handler->flags) {
@@ -432,9 +450,6 @@ static int erofs_xattr_generic_get(const struct xattr_handler *handler,
  return -EINVAL;
  }
 
- if (!vi->xattr_isize)
- return -ENOATTR;
-
  return erofs_getxattr(inode, handler->flags, name, buffer, size);
 }