[PATCH 2/2] ocfs2: Replace deprecated strcpy with strscpy

[Thorsten Blum <thorsten.blum@linux.dev>]

strcpy() has been deprecated [1] because it performs no bounds checking
on the destination buffer, which can lead to buffer overflows. Replace
it with the safer strscpy(), and copy directly into '->rf_signature'
instead of using the start of the struct as the destination buffer.

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strcpy [1]
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
---
 fs/ocfs2/refcounttree.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c
index 267b50e8e42e..c92e0ea85bca 100644
--- a/fs/ocfs2/refcounttree.c
+++ b/fs/ocfs2/refcounttree.c
@@ -34,6 +34,7 @@
 #include <linux/pagevec.h>
 #include <linux/swap.h>
 #include <linux/security.h>
+#include <linux/string.h>
 #include <linux/fsnotify.h>
 #include <linux/quotaops.h>
 #include <linux/namei.h>
@@ -621,7 +622,7 @@ static int ocfs2_create_refcount_tree(struct inode *inode,
 	/* Initialize ocfs2_refcount_block. */
 	rb = (struct ocfs2_refcount_block *)new_bh->b_data;
 	memset(rb, 0, inode->i_sb->s_blocksize);
-	strcpy((void *)rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE);
+	strscpy(rb->rf_signature, OCFS2_REFCOUNT_BLOCK_SIGNATURE);
 	rb->rf_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot);
 	rb->rf_suballoc_loc = cpu_to_le64(suballoc_loc);
 	rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
@@ -1562,7 +1563,7 @@ static int ocfs2_new_leaf_refcount_block(handle_t *handle,
 	/* Initialize ocfs2_refcount_block. */
 	new_rb = (struct ocfs2_refcount_block *)new_bh->b_data;
 	memset(new_rb, 0, sb->s_blocksize);
-	strcpy((void *)new_rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE);
+	strscpy(new_rb->rf_signature, OCFS2_REFCOUNT_BLOCK_SIGNATURE);
 	new_rb->rf_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot);
 	new_rb->rf_suballoc_loc = cpu_to_le64(suballoc_loc);
 	new_rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
-- 
2.51.1