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Subject[PATCH] xfs: removed useless condition in function xfs_attr_node_get
Date
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")
---
fs/xfs/libxfs/xfs_attr.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
index 224649a76cbb..6b8857e53add 100644
--- a/fs/xfs/libxfs/xfs_attr.c
+++ b/fs/xfs/libxfs/xfs_attr.c
@@ -1558,7 +1558,7 @@ 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;
}
--
2.25.1
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