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ext4: disallow ea_inodes with extended attributes
An ea_inode stores the value of an extended attribute; it can not have extended attributes itself, or this will cause recursive nightmares. Add a check in ext4_iget() to make sure this is the case. Cc: stable@kernel.org Reported-by: syzbot+e44749b6ba4d0434cd47@syzkaller.appspotmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu> Link: https://lore.kernel.org/r/20230524034951.779531-4-tytso@mit.edu Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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@ -4647,6 +4647,9 @@ static const char *check_igot_inode(struct inode *inode, ext4_iget_flags flags)
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if (flags & EXT4_IGET_EA_INODE) {
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if (!(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL))
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return "missing EA_INODE flag";
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if (ext4_test_inode_state(inode, EXT4_STATE_XATTR) ||
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EXT4_I(inode)->i_file_acl)
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return "ea_inode with extended attributes";
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} else {
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if ((EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL))
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return "unexpected EA_INODE flag";
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