From: Duane Griffin <duaneg@dghda.com>
Date: Thu, 8 Jan 2009 22:43:50 +0000 (+0000)
Subject: ufs: ensure fast symlinks are NUL-terminated
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b12903f1384cd176a3994a6bf6caf5a482169cc8;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

ufs: ensure fast symlinks are NUL-terminated

Ensure fast symlink targets are NUL-terminated, even if corrupted
on-disk.

Signed-off-by: Duane Griffin <duaneg@dghda.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/fs/ufs/inode.c b/fs/ufs/inode.c
index ac8b324415d3..3d2512c21f05 100644
--- a/fs/ufs/inode.c
+++ b/fs/ufs/inode.c
@@ -658,7 +658,8 @@ static int ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 		       sizeof(ufs_inode->ui_u2.ui_addr));
 	} else {
 		memcpy(ufsi->i_u1.i_symlink, ufs_inode->ui_u2.ui_symlink,
-		       sizeof(ufs_inode->ui_u2.ui_symlink));
+		       sizeof(ufs_inode->ui_u2.ui_symlink) - 1);
+		ufsi->i_u1.i_symlink[sizeof(ufs_inode->ui_u2.ui_symlink) - 1] = 0;
 	}
 	return 0;
 }
@@ -706,7 +707,8 @@ static int ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
 		       sizeof(ufs2_inode->ui_u2.ui_addr));
 	} else {
 		memcpy(ufsi->i_u1.i_symlink, ufs2_inode->ui_u2.ui_symlink,
-		       sizeof(ufs2_inode->ui_u2.ui_symlink));
+		       sizeof(ufs2_inode->ui_u2.ui_symlink) - 1);
+		ufsi->i_u1.i_symlink[sizeof(ufs2_inode->ui_u2.ui_symlink) - 1] = 0;
 	}
 	return 0;
 }