diff mbox series

[090/127] fat: don't allow to mount if the FAT length == 0

Message ID 20200604235056.ras4DFMTz%akpm@linux-foundation.org (mailing list archive)
State New, archived
Headers show
Series [001/127] kcov: cleanup debug messages | expand

Commit Message

Andrew Morton June 4, 2020, 11:50 p.m. UTC 
From: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Subject: fat: don't allow to mount if the FAT length == 0

If FAT length == 0, the image doesn't have any data. And it can be the
cause of overlapping the root dir and FAT entries.

Also Windows treats it as invalid format.

Link: http://lkml.kernel.org/r/87r1wz8mrd.fsf@mail.parknet.co.jp
Reported-by: syzbot+6f1624f937d9d6911e2d@syzkaller.appspotmail.com
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Cc: Marco Elver <elver@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/fat/inode.c |    6 ++++++
 1 file changed, 6 insertions(+)
diff mbox series

Patch

--- a/fs/fat/inode.c~fat-dont-allow-to-mount-if-the-fat-length-==-0
+++ a/fs/fat/inode.c
@@ -1519,6 +1519,12 @@  static int fat_read_bpb(struct super_blo
 		goto out;
 	}
 
+	if (bpb->fat_fat_length == 0 && bpb->fat32_length == 0) {
+		if (!silent)
+			fat_msg(sb, KERN_ERR, "bogus number of FAT sectors");
+		goto out;
+	}
+
 	error = 0;
 
 out: