From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EF0724DEC03; Wed, 30 Sep 2026 16:02:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790784163; cv=none; b=RvimzkLLzBoH8jjHYvH55a2sJfO5KUD2OlJSZWe20Er9rTCUzn1kkHGnptvBFuX+58iaPo9E+QMWVD3kuQMFKRLV9rDSBGiXXOK/86mHTCzNf20cXQ+VqO6F5mkdMcwGhyusok+iBWIseWFlpx2YyFUg4lxYPLXyM7fUi5DAriM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790784163; c=relaxed/simple; bh=OdPaOx9ReqxR+ew6EBbmbKrVHplgg3+6wcRyTazi064=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=PCQEs1hXzXDaprKKZ0RZrY+UWsLe2xuNTwYJmEgTOknKMvMfcl0QPeUZSUYWUcicN0pDDvlQqmPVPqJrvD5hoGg2R/2/Q92iBJ8VEDe7BoP1AaooyLDpUJZOqr5aym9UVBpdTAENlOdd1WiBThCWeSj9DbdiQitNiyvOz6JDbco= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=w6LEmhiA; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="w6LEmhiA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A0DD81F000FF; Wed, 30 Sep 2026 16:02:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790784159; bh=c/nLEmMD+9AcM6gWRy+za15ZTm2UZg84eKG1++XvLRo=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=w6LEmhiABHvfyCPqah2LJHIKEiyS6g80h2FeVJdXkAPu2LNbmD8D2JEyeC7AJqJeV r8g/PE6fvRIXCFhEkP0tM0VhhSmuWxAyT+Bu3OSHkDhiCI7juXww8dc9xjUxHfJ3C+ i7e5XSJYngQ8xAyrAbPZ6U5JEWyzlVDnow6G2rPY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Pierre Barre , Dominique Martinet , Sasha Levin Subject: [PATCH 6.1 056/982] 9p: use kvzalloc for readdir buffer Date: Wed, 30 Sep 2026 17:13:12 +0200 Message-ID: <20260930152417.995672596@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260930152416.775402466@linuxfoundation.org> References: <20260930152416.775402466@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Pierre Barre [ Upstream commit b4d71bea144550ff4a0917f8c4b06d4063eb27a6 ] 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 ("9p: Use kvmalloc for message buffers on supported transports"). Signed-off-by: Pierre Barre Message-ID: <20260512132032.369281-1-pierre@barre.sh> Signed-off-by: Dominique Martinet Signed-off-by: Sasha Levin --- 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 dd36dce582839..3be09b94a8e24 100644 --- a/fs/9p/vfs_dir.c +++ b/fs/9p/vfs_dir.c @@ -74,7 +74,7 @@ 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 70c2cf23128fb..1a65c51636188 100644 --- a/net/9p/client.c +++ b/net/9p/client.c @@ -880,7 +880,7 @@ 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); } -- 2.53.0