Commit a9ba36a4 authored by Kevin Wolf's avatar Kevin Wolf Committed by Stefan Hajnoczi
Browse files

bochs: Fix bitmap offset calculation 



32 bit truncation could let us access the wrong offset in the image.

Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
Reviewed-by: default avatarStefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: default avatarMax Reitz <mreitz@redhat.com>
Signed-off-by: default avatarStefan Hajnoczi <stefanha@redhat.com>
parent 8e53abbc

block/bochs.c

+3 −2
Original line number Diff line number Diff line
@@ -186,7 +186,8 @@ static int64_t seek_to_sector(BlockDriverState *bs, int64_t sector_num) 
	return -1; /* not allocated */

    }



    bitmap_offset = s->data_offset + (512 * s->catalog_bitmap[extent_index] *

    bitmap_offset = s->data_offset +

        (512 * (uint64_t) s->catalog_bitmap[extent_index] *

        (s->extent_blocks + s->bitmap_blocks));



    /* read in bitmap for current extent */