Patch "NFSv4: Fixup smatch warning for ambiguous return" has been added to the 6.6-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    NFSv4: Fixup smatch warning for ambiguous return

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     nfsv4-fixup-smatch-warning-for-ambiguous-return.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit b06dd49b202f4443a4391fae30a232c68f37f266
Author: Benjamin Coddington <bcodding@xxxxxxxxxx>
Date:   Wed Apr 17 14:49:29 2024 -0400

    NFSv4: Fixup smatch warning for ambiguous return
    
    [ Upstream commit 37ffe06537af3e3ec212e7cbe941046fce0a822f ]
    
    Dan Carpenter reports smatch warning for nfs4_try_migration() when a memory
    allocation failure results in a zero return value.  In this case, a
    transient allocation failure error will likely be retried the next time the
    server responds with NFS4ERR_MOVED.
    
    We can fixup the smatch warning with a small refactor: attempt all three
    allocations before testing and returning on a failure.
    
    Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
    Fixes: c3ed222745d9 ("NFSv4: Fix free of uninitialized nfs4_label on referral lookup.")
    Signed-off-by: Benjamin Coddington <bcodding@xxxxxxxxxx>
    Reviewed-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
    Reviewed-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
    Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 9a5d911a7edc7..c95c50328ced8 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -2117,6 +2117,7 @@ static int nfs4_try_migration(struct nfs_server *server, const struct cred *cred
 {
 	struct nfs_client *clp = server->nfs_client;
 	struct nfs4_fs_locations *locations = NULL;
+	struct nfs_fattr *fattr;
 	struct inode *inode;
 	struct page *page;
 	int status, result;
@@ -2126,19 +2127,16 @@ static int nfs4_try_migration(struct nfs_server *server, const struct cred *cred
 			(unsigned long long)server->fsid.minor,
 			clp->cl_hostname);
 
-	result = 0;
 	page = alloc_page(GFP_KERNEL);
 	locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
-	if (page == NULL || locations == NULL) {
-		dprintk("<-- %s: no memory\n", __func__);
-		goto out;
-	}
-	locations->fattr = nfs_alloc_fattr();
-	if (locations->fattr == NULL) {
+	fattr = nfs_alloc_fattr();
+	if (page == NULL || locations == NULL || fattr == NULL) {
 		dprintk("<-- %s: no memory\n", __func__);
+		result = 0;
 		goto out;
 	}
 
+	locations->fattr = fattr;
 	inode = d_inode(server->super->s_root);
 	result = nfs4_proc_get_locations(server, NFS_FH(inode), locations,
 					 page, cred);