linux-ext4 - [PATCH v2] fs: forbid invalid project ID

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Message-Id: <20210628123801.3511-1-wangshilong1991@gmail.com>
Date:   Mon, 28 Jun 2021 08:38:01 -0400
From:   Wang Shilong <wangshilong1991@...il.com>
To:     linux-fsdevel@...r.kernel.org
Cc:     linux-xfs@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, wangshilong1991@...il.com
Subject: [PATCH v2] fs: forbid invalid project ID

fileattr_set_prepare() should check if project ID
is valid, otherwise dqget() will return NULL for
such project ID quota.

Signed-off-by: Wang Shilong <wshilong@....com>
---
v1->v2: try to fix in the VFS
---
 fs/ioctl.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/ioctl.c b/fs/ioctl.c
index 1e2204fa9963..5db5b218637b 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -845,6 +845,9 @@ static int fileattr_set_prepare(struct inode *inode,
 	if (fa->fsx_cowextsize == 0)
 		fa->fsx_xflags &= ~FS_XFLAG_COWEXTSIZE;
 
+	if (!projid_valid(KPROJIDT_INIT(fa->fsx_projid)))
+		return -EINVAL;
+
 	return 0;
 }
 
-- 
2.27.0