From: Rustam Kovhaev <[email protected]> commit 4dfe6bd94959222e18d512bdf15f6bf9edb9c27c 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/[email protected] Link: https://syzkaller.appspot.com/bug?extid=c584225dabdea2f71969 Signed-off-by: Rustam Kovhaev <[email protected]> Reported-by: [email protected] Tested-by: [email protected] Acked-by: Anton Altaparmakov <[email protected]> Cc: <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- fs/ntfs/inode.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/fs/ntfs/inode.c +++ b/fs/ntfs/inode.c @@ -661,6 +661,12 @@ 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));
