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bochs: Fix bitmap offset calculation 

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

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
(cherry picked from commit a9ba36a45d)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This commit is contained in:
Kevin Wolf 2014-03-26 13:05:35 +01:00 committed by Michael Roth
parent b0a7517c24
commit 6ee0d5fdc7
1 changed files with 3 additions and 2 deletions
block
bochs.c

5
block/bochs.c
View File

@ -185,8 +185,9 @@ 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] *
(s->extent_blocks + s->bitmap_blocks));
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 */
if (bdrv_pread(bs->file, bitmap_offset + (extent_offset / 8),