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From:   Manas Ghandat <ghandatmanas@gmail.com>
To:     shaggy@kernel.org
Cc:     Manas Ghandat <ghandatmanas@gmail.com>,
        jfs-discussion@lists.sourceforge.net, linux-kernel@vger.kernel.org,
        Linux-kernel-mentees@lists.linuxfoundation.org
Subject: [PATCH] jfs: fix array-index-out-of-bounds in diAlloc
Date:   Tue, 26 Sep 2023 12:43:12 +0530
Message-Id: <20230926071312.14086-1-ghandatmanas@gmail.com>
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Currently there is not check against the agno of the iag while
allocating new inodes to avoid fragmentation problem. Added the check
which is required.

Signed-off-by: Manas Ghandat <ghandatmanas@gmail.com>
---
 fs/jfs/jfs_imap.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/jfs/jfs_imap.c b/fs/jfs/jfs_imap.c
index 799d3837e7c2..ace8a1506380 100644
--- a/fs/jfs/jfs_imap.c
+++ b/fs/jfs/jfs_imap.c
@@ -1355,6 +1355,8 @@ int diAlloc(struct inode *pip, bool dir, struct inode *ip)
 
 	/* get the ag number of this iag */
 	agno = BLKTOAG(JFS_IP(pip)->agstart, JFS_SBI(pip->i_sb));
+	if (agno < 0)
+		return -EIO;
 
 	if (atomic_read(&JFS_SBI(pip->i_sb)->bmap->db_active[agno])) {
 		/*
-- 
2.37.2