nfs: Annotate struct pnfs_commit_array with __counted_by()

Add the __counted_by compiler attribute to the flexible array member
buckets to improve access bounds-checking via CONFIG_UBSAN_BOUNDS and
CONFIG_FORTIFY_SOURCE.

Compile-tested only.

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 12d8e47bc5a38863b2831fb16056f742fa81612e..559273a0f16d81ef93b66c088cc0c5f86ab3109c 100644 (file)
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -1336,7 +1336,7 @@ struct pnfs_commit_array {
        struct rcu_head rcu;
        refcount_t refcount;
        unsigned int nbuckets;
-       struct pnfs_commit_bucket buckets[];
+       struct pnfs_commit_bucket buckets[] __counted_by(nbuckets);
 };
 
 struct pnfs_ds_commit_info {