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udf: Detect incorrect directory size

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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>
This commit is contained in:
Jan Kara 2018-06-13 12:09:22 +02:00
parent 27e6ed54a3
commit fa65653e57
1 changed files with 3 additions and 0 deletions
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3
fs/udf/directory.c
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@ -152,6 +152,9 @@ 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;
}