diff mbox series

ntfs3: fix OOB read in ntfs_init_from_boot

Message ID 20230713194146.93568-1-paskripkin@gmail.com
State New
Headers
Series ntfs3: fix OOB read in ntfs_init_from_boot |

Commit Message

Pavel Skripkin July 13, 2023, 7:41 p.m. UTC 
  Syzbot was able to create a device which has the last sector of size
512.

After failing to boot from initial sector, reading from boot info from
offset 511 causes OOB read.

To prevent such reports add sanity check to validate if size of buffer_head
if big enough to hold ntfs3 bootinfo

Fixes: 6a4cd3ea7d77 ("fs/ntfs3: Alternative boot if primary boot is corrupted")
Reported-by: syzbot+53ce40c8c0322c06aea5@syzkaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
---
 fs/ntfs3/super.c | 5 +++++
 1 file changed, 5 insertions(+)
diff mbox series

Patch

diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c
index 1a02072b6b0e..e04e89b7335e 100644
--- a/fs/ntfs3/super.c
+++ b/fs/ntfs3/super.c
@@ -855,6 +855,11 @@  static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size,
 
 check_boot:
 	err = -EINVAL;
+
+	/* Corrupted image; do not read OOB */
+	if (bh->b_size - sizeof(*boot) < boot_off)
+		goto out;
+
 	boot = (struct NTFS_BOOT *)Add2Ptr(bh->b_data, boot_off);
 
 	if (memcmp(boot->system_id, "NTFS    ", sizeof("NTFS    ") - 1)) {