[PATCH v3] xfs: Replace strncpy with memcpy

[PATCH v3] xfs: Replace strncpy with memcpy

[Marcelo Moreira]

The changes modernizes the code by aligning it with current kernel best
practices. It improves code clarity and consistency, as strncpy is deprecated
as explained in Documentation/process/deprecated.rst. This change does
not alter the functionality or introduce any behavioral changes.

Suggested-by: Dave Chinner <david@fromorbit.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Signed-off-by: Marcelo Moreira <marcelomoreira1905@gmail.com>
---
Changes since v2:
- Fixing some errors in the commit message.
Link to v2: https://lore.kernel.org/linux-kernel-mentees/CAPZ3m_iNj2zwpAovv3BTz8gNp5XzdxSRHBFonM9sJvaSjYVBeg@mail.gmail.com/T/#t

 fs/xfs/scrub/symlink_repair.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/xfs/scrub/symlink_repair.c b/fs/xfs/scrub/symlink_repair.c
index 953ce7be78dc..5902398185a8 100644
--- a/fs/xfs/scrub/symlink_repair.c
+++ b/fs/xfs/scrub/symlink_repair.c
@@ -185,7 +185,7 @@ xrep_symlink_salvage_inline(
 		return 0;
 
 	nr = min(XFS_SYMLINK_MAXLEN, xfs_inode_data_fork_size(ip));
-	strncpy(target_buf, ifp->if_data, nr);
+	memcpy(target_buf, ifp->if_data, nr);
 	return nr;
 }
 
-- 
2.50.1

Re: [PATCH v3] xfs: Replace strncpy with memcpy

[Darrick J. Wong]

On Wed, Aug 27, 2025 at 07:17:07PM -0300, Marcelo Moreira wrote:
> The changes modernizes the code by aligning it with current kernel best
> practices. It improves code clarity and consistency, as strncpy is deprecated
> as explained in Documentation/process/deprecated.rst. This change does
> not alter the functionality or introduce any behavioral changes.
> 
> Suggested-by: Dave Chinner <david@fromorbit.com>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
> Signed-off-by: Marcelo Moreira <marcelomoreira1905@gmail.com>

memcpy is fine, the repair code determines the new target length via
strnlen(bufsize) later on so we'll continue to fix the "non-null
characters after the zero terminator" case.

Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>

--D

> ---
> Changes since v2:
> - Fixing some errors in the commit message.
> Link to v2: https://lore.kernel.org/linux-kernel-mentees/CAPZ3m_iNj2zwpAovv3BTz8gNp5XzdxSRHBFonM9sJvaSjYVBeg@mail.gmail.com/T/#t
> 
>  fs/xfs/scrub/symlink_repair.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/xfs/scrub/symlink_repair.c b/fs/xfs/scrub/symlink_repair.c
> index 953ce7be78dc..5902398185a8 100644
> --- a/fs/xfs/scrub/symlink_repair.c
> +++ b/fs/xfs/scrub/symlink_repair.c
> @@ -185,7 +185,7 @@ xrep_symlink_salvage_inline(
>  		return 0;
>  
>  	nr = min(XFS_SYMLINK_MAXLEN, xfs_inode_data_fork_size(ip));
> -	strncpy(target_buf, ifp->if_data, nr);
> +	memcpy(target_buf, ifp->if_data, nr);
>  	return nr;
>  }
>  
> -- 
> 2.50.1
> 
>