[PATCH 1/2] 9p: use kvzalloc for readdir buffer

[Pierre Barre <pierre@barre.sh>]

The readdir buffer is sized to msize, so kzalloc() can fail under
fragmentation with a page allocation failure in v9fs_alloc_rdir_buf()
/ v9fs_dir_readdir_dotl().

The buffer is only a response sink and is never pack_sg_list()'d,
so kvzalloc() is safe for all transports, unlike the fcall buffers
fixed in e21d451a82f3.

Signed-off-by: Pierre Barre <pierre@barre.sh>
---
 fs/9p/vfs_dir.c | 2 +-
 net/9p/client.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/9p/vfs_dir.c b/fs/9p/vfs_dir.c
index af7f72abbb76..487c177aae38 100644
--- a/fs/9p/vfs_dir.c
+++ b/fs/9p/vfs_dir.c
@@ -70,7 +70,7 @@ static struct p9_rdir *v9fs_alloc_rdir_buf(struct file *filp, int buflen)
 	struct p9_fid *fid = filp->private_data;
 
 	if (!fid->rdir)
-		fid->rdir = kzalloc(sizeof(struct p9_rdir) + buflen, GFP_KERNEL);
+		fid->rdir = kvzalloc(sizeof(struct p9_rdir) + buflen, GFP_KERNEL);
 	return fid->rdir;
 }
 
diff --git a/net/9p/client.c b/net/9p/client.c
index f60d1d041adb..6d9b9054841e 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -765,7 +765,7 @@ static void p9_fid_destroy(struct p9_fid *fid)
 	spin_lock_irqsave(&clnt->lock, flags);
 	idr_remove(&clnt->fids, fid->fid);
 	spin_unlock_irqrestore(&clnt->lock, flags);
-	kfree(fid->rdir);
+	kvfree(fid->rdir);
 	kfree(fid);
 }
 
-- 
2.51.0