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udf: Detect incorrect directory size

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commit fa65653e57 upstream.

Detect when a directory entry is (possibly partially) beyond directory
size and return EIO in that case since it means the filesystem is
corrupted. Otherwise directory operations can further corrupt the
directory and possibly also oops the kernel.

CC: Anatoly Trosinenko <anatoly.trosinenko@gmail.com>
CC: stable@vger.kernel.org
Reported-and-tested-by: Anatoly Trosinenko <anatoly.trosinenko@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jan Kara 2018-06-13 12:09:22 +02:00 committed by Greg Kroah-Hartman
parent 3cac26f2a2
commit 2a1b1234d0
1 changed files with 3 additions and 0 deletions
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3
fs/udf/directory.c
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@ -150,6 +150,9 @@ struct fileIdentDesc *udf_fileident_read(struct inode *dir, loff_t *nf_pos,
sizeof(struct fileIdentDesc));
}
}
/* Got last entry outside of dir size - fs is corrupted! */
if (*nf_pos > dir->i_size)
return NULL;
return fi;
}