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authorTheodore Ts'o <tytso@mit.edu>2009-04-24 21:43:20 +0400
committerTheodore Ts'o <tytso@mit.edu>2009-04-24 21:43:20 +0400
commit485c26ec70f823f2a9cf45982b724893e53a859e (patch)
tree545ee089625b9b4131773eb26c57a51889deda78 /fs
parent0c8454f56623505a99463405fd7d5664adfbb094 (diff)
downloadlinux-485c26ec70f823f2a9cf45982b724893e53a859e.tar.xz
ext4: Fix softlockup caused by illegal i_file_acl value in on-disk inode
If the block containing external extended attributes (which is stored in i_file_acl and i_file_acl_high) is larger than the on-disk filesystem, the process which tried to access the extended attributes will endlessly issue kernel printks complaining that "__find_get_block_slow() failed", locking up that CPU until the system is forcibly rebooted. So when we read in the inode, make sure the i_file_acl value is legal, and if not, flag the filesystem as being corrupted. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs')
-rw-r--r--fs/ext4/inode.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index c6bd6ced3bb7..cab75bbcd57b 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4409,7 +4409,17 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
(__u64)(le32_to_cpu(raw_inode->i_version_hi)) << 32;
}
- if (ei->i_flags & EXT4_EXTENTS_FL) {
+ if (ei->i_file_acl &&
+ ((ei->i_file_acl <
+ (le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) +
+ EXT4_SB(sb)->s_gdb_count)) ||
+ (ei->i_file_acl >= ext4_blocks_count(EXT4_SB(sb)->s_es)))) {
+ ext4_error(sb, __func__,
+ "bad extended attribute block %llu in inode #%lu",
+ ei->i_file_acl, inode->i_ino);
+ ret = -EIO;
+ goto bad_inode;
+ } else if (ei->i_flags & EXT4_EXTENTS_FL) {
/* Validate extent which is part of inode */
ret = ext4_ext_check_inode(inode);
} else if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||