linux-kernel - Re: [PATCH V4 1/2] erofs: use kmemdup_nul in erofs_fill

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Message-ID: <ZtV/speqypBt99sE@debian>
Date: Mon, 2 Sep 2024 17:04:50 +0800
From: Gao Xiang <xiang@...nel.org>
To: Gao Xiang <hsiangkao@...ux.alibaba.com>
Cc: Yiyang Wu <toolmanp@...p.cc>, linux-erofs@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH V4 1/2] erofs: use kmemdup_nul in erofs_fill_symlink

On Mon, Sep 02, 2024 at 04:52:30PM +0800, Gao Xiang wrote:
> 
> 
> On 2024/9/2 16:31, Yiyang Wu wrote:
> > Remove open coding in erofs_fill_symlink.
> > 
> > Suggested-by: Al Viro <viro@...iv.linux.org.uk>
> > Link: https://lore.kernel.org/all/20240425222847.GN2118490@ZenIV
> > Signed-off-by: Yiyang Wu <toolmanp@...p.cc>
> 
> If a patch is unchanged, you have two ways to handle:
>  - resend the patch with new received "Reviewed-by";
>  - just send the updated [PATCH 2/2] with new version
>    and `--in-reply-to=<old message id>`.
> 
> I will apply this patch first.

I applied this patch as

>From b3c5375ceb2944a7e4d34a6fb106ecd4614260d7 Mon Sep 17 00:00:00 2001
From: Yiyang Wu <toolmanp@...p.cc>
Date: Mon, 2 Sep 2024 16:31:46 +0800
Subject: erofs: use kmemdup_nul in erofs_fill_symlink

Remove open coding in erofs_fill_symlink.

Suggested-by: Al Viro <viro@...iv.linux.org.uk>
Link: https://lore.kernel.org/all/20240425222847.GN2118490@ZenIV
Signed-off-by: Yiyang Wu <toolmanp@...p.cc>
Link: https://lore.kernel.org/r/20240902083147.450558-2-toolmanp@tlmp.cc
Reviewed-by: Gao Xiang <hsiangkao@...ux.alibaba.com>
Signed-off-by: Gao Xiang <hsiangkao@...ux.alibaba.com>
---
 fs/erofs/inode.c | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c
index 82259553d9f641..68ea67e0caf33a 100644
--- a/fs/erofs/inode.c
+++ b/fs/erofs/inode.c
@@ -179,7 +179,6 @@ static int erofs_fill_symlink(struct inode *inode,
void *kaddr,
 {
 	struct erofs_inode *vi = EROFS_I(inode);
 	unsigned int bsz = i_blocksize(inode);
-	char *lnk;
 
 	/* if it cannot be handled with fast symlink scheme */
 	if (vi->datalayout != EROFS_INODE_FLAT_INLINE ||
@@ -188,24 +187,18 @@ 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",
+		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';
 
-	inode->i_link = lnk;
+	inode->i_link = kmemdup_nul(kaddr + m_pofs, inode->i_size,
GFP_KERNEL);
+	if (!inode->i_link)
+		return -ENOMEM;
 	inode->i_op = &erofs_fast_symlink_iops;
 	return 0;
 }


To fix a redundant tab and a blank line.

Thanks,
Gao Xiang