[PATCH 2/2] erofs: use kmemdup_nul in erofs_fill_symlink

[Yiyang Wu via Linux-erofs]

Remove open coding in erofs_fill_symlink.

Suggested-by: Al Viro <v...@zeniv.linux.org.uk>
Link: https://lore.kernel.org/all/20240425222847.GN2118490@ZenIV
Signed-off-by: Yiyang Wu <toolm...@tlmp.cc>
---
 fs/erofs/inode.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c
index 90f1235dc404..f435752143cb 100644
--- a/fs/erofs/inode.c
+++ b/fs/erofs/inode.c
@@ -21,23 +21,20 @@ static int erofs_fill_symlink(struct inode *inode, void 
*kaddr,
                return 0;
        }
 
-       lnk = kmalloc(inode->i_size + 1, GFP_KERNEL);
-       if (!lnk)
-               return -ENOMEM;
-
        m_pofs += vi->xattr_isize;
+
        /* inline symlink data shouldn't cross block boundary */
        if (m_pofs + inode->i_size > bsz) {
-               kfree(lnk);
                erofs_err(inode->i_sb,
                          "inline data cross block boundary @ nid %llu",
                          vi->nid);
                DBG_BUGON(1);
                return -EFSCORRUPTED;
        }
-       memcpy(lnk, kaddr + m_pofs, inode->i_size);
-       lnk[inode->i_size] = '\0';
 
+       lnk = kmemdup_nul(kaddr+m_pofs, inode->i_size, GFP_KERNEL);
+       if (!lnk)
+               return -ENOMEM;
        inode->i_link = lnk;
        return 0;
 }
-- 
2.46.0