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isofs: fix access to unallocated memory when reading corrupted filesystem

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When a directory on isofs is corrupted, we did not check whether length of the
name in a directory entry and the length of the directory entry itself are
consistent.  This could lead to possible access beyond the end of buffer when
the length of the name was too big.  Add this sanity check to directory
reading code.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jan Kara 2008-04-30 00:52:33 -07:00 committed by Linus Torvalds
parent 6bfe0b4990
commit 2deb1acc65
2 changed files with 15 additions and 0 deletions
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8
fs/isofs/dir.c
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@ -145,6 +145,14 @@ static int do_isofs_readdir(struct inode *inode, struct file *filp,
}
de = tmpde;
}
/* Basic sanity check, whether name doesn't exceed dir entry */
if (de_len < de->name_len[0] +
sizeof(struct iso_directory_record)) {
printk(KERN_NOTICE "iso9660: Corrupted directory entry"
" in block %lu of inode %lu\n", block,
inode->i_ino);
return -EIO;
}
if (first_de) {
isofs_normalize_block_and_offset(de,

7
fs/isofs/namei.c
View File

@ -111,6 +111,13 @@ isofs_find_entry(struct inode *dir, struct dentry *dentry,
dlen = de->name_len[0];
dpnt = de->name;
/* Basic sanity check, whether name doesn't exceed dir entry */
if (de_len < dlen + sizeof(struct iso_directory_record)) {
printk(KERN_NOTICE "iso9660: Corrupted directory entry"
" in block %lu of inode %lu\n", block,
dir->i_ino);
return 0;
}
if (sbi->s_rock &&
((i = get_rock_ridge_filename(de, tmpname, dir)))) {