The patch titled
Subject: ntfs: check for valid standard information attribute
has been added to the -mm tree. Its filename is
ntfs-check-for-valid-standard-information-attribute.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/ntfs-check-for-valid-standard-information-attribute.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/ntfs-check-for-valid-standard-information-attribute.patch
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------------------------------------------------------
From: Rustam Kovhaev <rkovhaev@xxxxxxxxx>
Subject: ntfs: check for valid standard information attribute
Mounting a corrupted filesystem with NTFS resulted in a kernel crash.
We should check for valid STANDARD_INFORMATION attribute offset and length
before trying to access it
Link: https://lkml.kernel.org/r/20210217155930.1506815-1-rkovhaev@xxxxxxxxx
Link: https://syzkaller.appspot.com/bug?extid=c584225dabdea2f71969
Signed-off-by: Rustam Kovhaev <rkovhaev@xxxxxxxxx>
Reported-by: syzbot+c584225dabdea2f71969@xxxxxxxxxxxxxxxxxxxxxxxxx
Tested-by: syzbot+c584225dabdea2f71969@xxxxxxxxxxxxxxxxxxxxxxxxx
Acked-by: Anton Altaparmakov <anton@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/ntfs/inode.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/fs/ntfs/inode.c~ntfs-check-for-valid-standard-information-attribute
+++ a/fs/ntfs/inode.c
@@ -629,6 +629,12 @@ static int ntfs_read_locked_inode(struct
}
a = ctx->attr;
/* Get the standard information attribute value. */
+ if ((u8 *)a + le16_to_cpu(a->data.resident.value_offset)
+ + le32_to_cpu(a->data.resident.value_length) >
+ (u8 *)ctx->mrec + vol->mft_record_size) {
+ ntfs_error(vi->i_sb, "Corrupt standard information attribute in inode.");
+ goto unm_err_out;
+ }
si = (STANDARD_INFORMATION*)((u8*)a +
le16_to_cpu(a->data.resident.value_offset));
_
Patches currently in -mm which might be from rkovhaev@xxxxxxxxx are
ntfs-check-for-valid-standard-information-attribute.patch
