fs/ntfs3: Add rough attr alloc_size check

aalexandrovich · gregkh · commit effac690913a · 2025-03-13T12:53:25.000+01:00
commit c4a8ba334262e9a5c158d618a4820e1b9c12495c upstream.

Reported-by: syzbot+c6d94bedd910a8216d25@syzkaller.appspotmail.com
Signed-off-by: Konstantin Komarov &lt;almaz.alexandrovich@paragon-software.com&gt;
Signed-off-by: Bin Lan &lt;bin.lan.cn@windriver.com&gt;
Signed-off-by: He Zhe &lt;zhe.he@windriver.com&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;
diff --git a/fs/ntfs3/record.c b/fs/ntfs3/record.c
@@ -325,6 +325,9 @@ struct ATTRIB *mi_enum_attr(struct mft_inode *mi, struct ATTRIB *attr)
 	} else {
 		if (attr->nres.c_unit)
 			return NULL;
+
+		if (alloc_size > mi->sbi->volume.size)
+			return NULL;
 	}
 
 	return attr;

Original file line number	Diff line number	Diff line change
`@@ -325,6 +325,9 @@ struct ATTRIB mi_enum_attr(struct mft_inode mi, struct ATTRIB *attr)`
`325`	`325`	`} else {`
`326`	`326`	`if (attr->nres.c_unit)`
`327`	`327`	`return NULL;`
	`328`	`+`
	`329`	`+ if (alloc_size > mi->sbi->volume.size)`
	`330`	`+ return NULL;`
`328`	`331`	`}`
`329`	`332`
`330`	`333`	`return attr;`