linux-kernel - [PATCH v1 2/3] xfs/libxfs: replace kmalloc() and memcpy() with kmemdup()

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Message-ID: <20241217225811.2437150-4-mtodorovac69@gmail.com>
Date: Tue, 17 Dec 2024 23:58:12 +0100
From: Mirsad Todorovac <mtodorovac69@...il.com>
To: Alex Deucher <alexander.deucher@....com>,
	Victor Skvortsov <victor.skvortsov@....com>,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Cc: Christian König <christian.koenig@....com>,
	Xinhui Pan <Xinhui.Pan@....com>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Mirsad Todorovac <mtodorovac69@...il.com>,
	Carlos Maiolino <cem@...nel.org>,
	"Darrick J. Wong" <djwong@...nel.org>,
	Chandan Babu R <chandanbabu@...nel.org>,
	Dave Chinner <dchinner@...hat.com>,
	linux-xfs@...r.kernel.org
Subject: [PATCH v1 2/3] xfs/libxfs: replace kmalloc() and memcpy() with kmemdup()

The source static analysis tool gave the following advice:

./fs/xfs/libxfs/xfs_dir2.c:382:15-22: WARNING opportunity for kmemdup

 → 382         args->value = kmalloc(len,
   383                          GFP_KERNEL | __GFP_NOLOCKDEP | __GFP_RETRY_MAYFAIL);
   384         if (!args->value)
   385                 return -ENOMEM;
   386
 → 387         memcpy(args->value, name, len);
   388         args->valuelen = len;
   389         return -EEXIST;

Replacing kmalloc() + memcpy() with kmemdump() doesn't change semantics.
Original code works without fault, so this is not a bug fix but proposed improvement.

Link: https://lwn.net/Articles/198928/
Fixes: 94a69db2367ef ("xfs: use __GFP_NOLOCKDEP instead of GFP_NOFS")
Fixes: 384f3ced07efd ("[XFS] Return case-insensitive match for dentry cache")
Fixes: 2451337dd0439 ("xfs: global error sign conversion")
Cc: Carlos Maiolino <cem@...nel.org>
Cc: "Darrick J. Wong" <djwong@...nel.org>
Cc: Chandan Babu R <chandanbabu@...nel.org>
Cc: Dave Chinner <dchinner@...hat.com>
Cc: linux-xfs@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Mirsad Todorovac <mtodorovac69@...il.com>
---
 v1:
	initial version.

 fs/xfs/libxfs/xfs_dir2.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_dir2.c b/fs/xfs/libxfs/xfs_dir2.c
index 202468223bf9..24251e42bdeb 100644
--- a/fs/xfs/libxfs/xfs_dir2.c
+++ b/fs/xfs/libxfs/xfs_dir2.c
@@ -379,12 +379,11 @@ xfs_dir_cilookup_result(
 					!(args->op_flags & XFS_DA_OP_CILOOKUP))
 		return -EEXIST;
 
-	args->value = kmalloc(len,
+	args->value = kmemdup(name, len,
 			GFP_KERNEL | __GFP_NOLOCKDEP | __GFP_RETRY_MAYFAIL);
 	if (!args->value)
 		return -ENOMEM;
 
-	memcpy(args->value, name, len);
 	args->valuelen = len;
 	return -EEXIST;
 }
-- 
2.43.0