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ntfs: check for valid standard information attribute 

commit 4dfe6bd949 upstream.

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@gmail.com
Link: https://syzkaller.appspot.com/bug?extid=c584225dabdea2f71969
Signed-off-by: Rustam Kovhaev <rkovhaev@gmail.com>
Reported-by: syzbot+c584225dabdea2f71969@syzkaller.appspotmail.com
Tested-by: syzbot+c584225dabdea2f71969@syzkaller.appspotmail.com
Acked-by: Anton Altaparmakov <anton@tuxera.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rustam Kovhaev 2021-02-24 12:00:30 -08:00 committed by Greg Kroah-Hartman
parent 54a3c25368
commit 74c8a6af69
1 changed files with 6 additions and 0 deletions
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6
fs/ntfs/inode.c
View File

@ -628,6 +628,12 @@ static int ntfs_read_locked_inode(struct inode *vi)
}
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));