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Btrfs: fix divide error upon chunk's stripe_len 

The struct 'map_lookup' uses type int for @stripe_len, while
btrfs_chunk_stripe_len() can return a u64 value, and it may end up with
@stripe_len being undefined value and it can lead to 'divide error' in
 __btrfs_map_block().

This changes 'map_lookup' to use type u64 for stripe_len, also right now
we only use BTRFS_STRIPE_LEN for stripe_len, so this adds a valid checker for
BTRFS_STRIPE_LEN.

Reported-by: Vegard Nossum <vegard.nossum@oracle.com>
Reported-by: Quentin Casasnovas <quentin.casasnovas@oracle.com>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ folded division fix to scrub_raid56_parity ]
Signed-off-by: David Sterba <dsterba@suse.com>
hifive-unleashed-5.1
Liu Bo 2016-04-26 17:53:31 -07:00 committed by David Sterba
parent ee17fc8005
commit 3d8da67817
3 changed files with 3 additions and 3 deletions
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2
fs/btrfs/scrub.c
View File

@ -2860,7 +2860,7 @@ static noinline_for_stack int scrub_raid56_parity(struct scrub_ctx *sctx,
int extent_mirror_num;
int stop_loop = 0;
nsectors = map->stripe_len / root->sectorsize;
nsectors = div_u64(map->stripe_len, root->sectorsize);
bitmap_len = scrub_calc_parity_bitmap_len(nsectors);
sparity = kzalloc(sizeof(struct scrub_parity) + 2 * bitmap_len,
GFP_NOFS);

2
fs/btrfs/volumes.c
View File

@ -6254,7 +6254,7 @@ static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
"invalid chunk length %llu", length);
return -EIO;
}
if (!is_power_of_2(stripe_len)) {
if (!is_power_of_2(stripe_len) || stripe_len != BTRFS_STRIPE_LEN) {
btrfs_err(root->fs_info, "invalid chunk stripe length: %llu",
stripe_len);
return -EIO;

2
fs/btrfs/volumes.h
View File

@ -347,7 +347,7 @@ struct map_lookup {
u64 type;
int io_align;
int io_width;
int stripe_len;
u64 stripe_len;
int sector_size;
int num_stripes;
int sub_stripes;