xfsprogs/xfsprogs-5.19.0-xfs-removed-useless-condition-in-function-xfs_attr_n.patch

From 798d43495df2c8a09a73b8e868a71d8f2fd81d5e Mon Sep 17 00:00:00 2001
From: Andrey Strachuk <strochuk@ispras.ru>
Date: Wed, 24 Aug 2022 10:24:01 +0200
Subject: [PATCH] xfs: removed useless condition in function xfs_attr_node_get

Source kernel commit: 0f38063d7a38015a47ca1488406bf21e0effe80e

At line 1561, variable "state" is being compared
with NULL every loop iteration.

-------------------------------------------------------------------
1561    for (i = 0; state != NULL && i < state->path.active; i++) {
1562            xfs_trans_brelse(args->trans, state->path.blk[i].bp);
1563            state->path.blk[i].bp = NULL;
1564    }
-------------------------------------------------------------------

However, it cannot be NULL.

----------------------------------------
1546    state = xfs_da_state_alloc(args);
----------------------------------------

xfs_da_state_alloc calls kmem_cache_zalloc. kmem_cache_zalloc is
called with __GFP_NOFAIL flag and, therefore, it cannot return NULL.

--------------------------------------------------------------------------
struct xfs_da_state *
xfs_da_state_alloc(
struct xfs_da_args      *args)
{
struct xfs_da_state     *state;

state = kmem_cache_zalloc(xfs_da_state_cache, GFP_NOFS | __GFP_NOFAIL);
state->args = args;
state->mp = args->dp->i_mount;
return state;
}
--------------------------------------------------------------------------

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Andrey Strachuk <strochuk@ispras.ru>

Fixes: 4d0cdd2bb8f0 ("xfs: clean up xfs_attr_node_hasname")
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
Signed-off-by: Pavel Reichl <preichl@redhat.com>
---
 libxfs/xfs_attr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libxfs/xfs_attr.c b/libxfs/xfs_attr.c
index 08973934..b451fcdb 100644
--- a/libxfs/xfs_attr.c
+++ b/libxfs/xfs_attr.c
@@ -1556,7 +1556,7 @@ xfs_attr_node_get(
 	 * If not in a transaction, we have to release all the buffers.
 	 */
 out_release:
-	for (i = 0; state != NULL && i < state->path.active; i++) {
+	for (i = 0; i < state->path.active; i++) {
 		xfs_trans_brelse(args->trans, state->path.blk[i].bp);
 		state->path.blk[i].bp = NULL;
 	}
-- 
2.40.0