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@xxxxxxxxxx>
---
fs/nfs/blocklayout/blocklayout.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index 334570888649..9919d9e98fa6 100644
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -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);
}
--
2.9.3
--
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