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pnfs/blocklayout: Ensure disk address in block device map 

It's possible that the device map is smaller than the offset into the device
for the I/O we're adding.  Add a check for it and bail out, otherwise we
risk botching the bio calculations that follow.

Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Trond Myklebust <trondmy@gmail.com>
This commit is contained in:
Benjamin Coddington 2018-01-25 09:36:26 -05:00 committed by Trond Myklebust
parent b39604755c
commit f34462c3c8
1 changed files with 7 additions and 2 deletions
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9
fs/nfs/blocklayout/blocklayout.c
View File

@ -137,6 +137,11 @@ bl_alloc_init_bio(int npg, struct block_device *bdev, sector_t disk_sector,
return bio;
}
static bool offset_in_map(u64 offset, struct pnfs_block_dev_map *map)
{
return offset >= map->start && offset < map->start + map->len;
}
static struct bio *
do_add_page_to_bio(struct bio *bio, int npg, int rw, sector_t isect,
struct page *page, struct pnfs_block_dev_map *map,
@ -156,8 +161,8 @@ do_add_page_to_bio(struct bio *bio, int npg, int rw, sector_t isect,
/* translate to physical disk offset */
disk_addr = (u64)isect << SECTOR_SHIFT;
if (disk_addr < map->start || disk_addr >= map->start + map->len) {
if (!dev->map(dev, disk_addr, map))
if (!offset_in_map(disk_addr, map)) {
if (!dev->map(dev, disk_addr, map) || !offset_in_map(disk_addr, map))
return ERR_PTR(-EIO);
bio = bl_submit_bio(bio);
}