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authorBenjamin Coddington <bcodding@redhat.com>2018-01-25 17:36:26 +0300
committerTrond Myklebust <trondmy@gmail.com>2018-01-26 00:42:35 +0300
commitf34462c3c8a2ec0f09003b526c4d7c08782d9350 (patch)
tree9d0c0a8f6f81c464606d40af860d87c8c636765d /fs/nfs
parentb39604755ce06389357b0c22d138c954f2e96451 (diff)
downloadlinux-f34462c3c8a2ec0f09003b526c4d7c08782d9350.tar.xz
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>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/blocklayout/blocklayout.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index ca6cf54b54df..7cb5c38c19e4 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);
}