linux-ext4 - [PATCH,STABLE 2.6.29 10/18] ext4: Check for an valid i

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Message-Id: <1243944479-20574-10-git-send-email-tytso@mit.edu>
Date:	Tue,  2 Jun 2009 08:07:51 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	stable@...nel.org
Cc:	linux-ext4@...r.kernel.org, Theodore Ts'o <tytso@....edu>
Subject: [PATCH,STABLE 2.6.29 10/18] ext4: Check for an valid i_mode when reading the inode from disk

Signed-off-by: "Theodore Ts'o" <tytso@....edu>
(cherry picked from commit 563bdd61fe4dbd6b58cf7eb06f8d8f14479ae1dc)
---
 fs/ext4/inode.c |   10 +++++++++-
 1 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 8ff6762..c4f0e14 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4367,7 +4367,8 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
 			inode->i_op = &ext4_symlink_inode_operations;
 			ext4_set_aops(inode);
 		}
-	} else {
+	} else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
+	      S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
 		inode->i_op = &ext4_special_inode_operations;
 		if (raw_inode->i_block[0])
 			init_special_inode(inode, inode->i_mode,
@@ -4375,6 +4376,13 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
 		else
 			init_special_inode(inode, inode->i_mode,
 			   new_decode_dev(le32_to_cpu(raw_inode->i_block[1])));
+	} else {
+		brelse(bh);
+		ret = -EIO;
+		ext4_error(inode->i_sb, __func__, 
+			   "bogus i_mode (%o) for inode=%lu",
+			   inode->i_mode, inode->i_ino);
+		goto bad_inode;
 	}
 	brelse(iloc.bh);
 	ext4_set_inode_flags(inode);
-- 
1.6.3.1.1.g75fc.dirty

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