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Wed, 15 Apr 2026 01:46:02 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Date: Wed, 15 Apr 2026 07:45:08 +0200 From: "Pierre Barre" To: "Eric Van Hensbergen" , "Latchesar Ionkov" , "Dominique Martinet" Cc: "Christian Schoenebeck" , v9fs@lists.linux.dev, linux-kernel@vger.kernel.org Message-Id: <06399e04-b019-4c3d-b941-5771b6ac33c2@app.fastmail.com> Subject: [PATCH] 9p: use kvzalloc for readdir buffer Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 --- 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 *f= ilp, int buflen) struct p9_fid *fid =3D filp->private_data; if (!fid->rdir) - fid->rdir =3D kzalloc(sizeof(struct p9_rdir) + buflen, GFP_= KERNEL); + fid->rdir =3D 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