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- Two stable@ fixes for the verity target's FEC support 

- A stable@ fix for raid target's raid1 support (when no bitmap is used)
 
 - A 4.11 cache metadata v2 format fix to properly test blocks are clean
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Merge tag 'dm-4.11-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper fixes from Mike Snitzer:

 - two stable fixes for the verity target's FEC support

 - a stable fix for raid target's raid1 support (when no bitmap is used)

 - a 4.11 cache metadata v2 format fix to properly test blocks are clean

* tag 'dm-4.11-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm verity fec: fix bufio leaks
  dm raid: fix NULL pointer dereference for raid1 without bitmap
  dm cache metadata: fix metadata2 format's blocks_are_clean_separate_dirty
  dm verity fec: limit error correction recursion
This commit is contained in:
Linus Torvalds 2017-04-07 10:47:20 -07:00
parent dc25ad3fe1 86e3e83b44
commit 81d4bab4ce
4 changed files with 24 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/md/dm-cache-metadata.c
View File

@ -932,7 +932,7 @@ static int blocks_are_clean_separate_dirty(struct dm_cache_metadata *cmd,
*result = true;
r = dm_bitset_cursor_begin(&cmd->dirty_info, cmd->dirty_root,
from_cblock(begin), &cmd->dirty_cursor);
from_cblock(cmd->cache_blocks), &cmd->dirty_cursor);
if (r) {
DMERR("%s: dm_bitset_cursor_begin for dirty failed", __func__);
return r;
@ -959,14 +959,16 @@ static int blocks_are_clean_separate_dirty(struct dm_cache_metadata *cmd,
return 0;
}
begin = to_cblock(from_cblock(begin) + 1);
if (begin == end)
break;
r = dm_bitset_cursor_next(&cmd->dirty_cursor);
if (r) {
DMERR("%s: dm_bitset_cursor_next for dirty failed", __func__);
dm_bitset_cursor_end(&cmd->dirty_cursor);
return r;
}
begin = to_cblock(from_cblock(begin) + 1);
}
dm_bitset_cursor_end(&cmd->dirty_cursor);

2
drivers/md/dm-raid.c
View File

@ -3726,7 +3726,7 @@ static int raid_preresume(struct dm_target *ti)
return r;
/* Resize bitmap to adjust to changed region size (aka MD bitmap chunksize) */
if (test_bit(RT_FLAG_RS_BITMAP_LOADED, &rs->runtime_flags) &&
if (test_bit(RT_FLAG_RS_BITMAP_LOADED, &rs->runtime_flags) && mddev->bitmap &&
mddev->bitmap_info.chunksize != to_bytes(rs->requested_bitmap_chunk_sectors)) {
r = bitmap_resize(mddev->bitmap, mddev->dev_sectors,
to_bytes(rs->requested_bitmap_chunk_sectors), 0);

18
drivers/md/dm-verity-fec.c
View File

@ -146,8 +146,6 @@ static int fec_decode_bufs(struct dm_verity *v, struct dm_verity_fec_io *fio,
block = fec_buffer_rs_block(v, fio, n, i);
res = fec_decode_rs8(v, fio, block, &par[offset], neras);
if (res < 0) {
dm_bufio_release(buf);
r = res;
goto error;
}
@ -172,6 +170,8 @@ static int fec_decode_bufs(struct dm_verity *v, struct dm_verity_fec_io *fio,
done:
r = corrected;
error:
dm_bufio_release(buf);
if (r < 0 && neras)
DMERR_LIMIT("%s: FEC %llu: failed to correct: %d",
v->data_dev->name, (unsigned long long)rsb, r);
@ -269,7 +269,7 @@ static int fec_read_bufs(struct dm_verity *v, struct dm_verity_io *io,
&is_zero) == 0) {
/* skip known zero blocks entirely */
if (is_zero)
continue;
goto done;
/*
* skip if we have already found the theoretical
@ -439,6 +439,13 @@ int verity_fec_decode(struct dm_verity *v, struct dm_verity_io *io,
if (!verity_fec_is_enabled(v))
return -EOPNOTSUPP;
if (fio->level >= DM_VERITY_FEC_MAX_RECURSION) {
DMWARN_LIMIT("%s: FEC: recursion too deep", v->data_dev->name);
return -EIO;
}
fio->level++;
if (type == DM_VERITY_BLOCK_TYPE_METADATA)
block += v->data_blocks;
@ -470,7 +477,7 @@ int verity_fec_decode(struct dm_verity *v, struct dm_verity_io *io,
if (r < 0) {
r = fec_decode_rsb(v, io, fio, rsb, offset, true);
if (r < 0)
return r;
goto done;
}
if (dest)
@ -480,6 +487,8 @@ int verity_fec_decode(struct dm_verity *v, struct dm_verity_io *io,
r = verity_for_bv_block(v, io, iter, fec_bv_copy);
}
done:
fio->level--;
return r;
}
@ -520,6 +529,7 @@ void verity_fec_init_io(struct dm_verity_io *io)
memset(fio->bufs, 0, sizeof(fio->bufs));
fio->nbufs = 0;
fio->output = NULL;
fio->level = 0;
}
/*

4
drivers/md/dm-verity-fec.h
View File

@ -27,6 +27,9 @@
#define DM_VERITY_FEC_BUF_MAX \
(1 << (PAGE_SHIFT - DM_VERITY_FEC_BUF_RS_BITS))
/* maximum recursion level for verity_fec_decode */
#define DM_VERITY_FEC_MAX_RECURSION 4
#define DM_VERITY_OPT_FEC_DEV "use_fec_from_device"
#define DM_VERITY_OPT_FEC_BLOCKS "fec_blocks"
#define DM_VERITY_OPT_FEC_START "fec_start"
@ -58,6 +61,7 @@ struct dm_verity_fec_io {
unsigned nbufs; /* number of buffers allocated */
u8 *output; /* buffer for corrected output */
size_t output_pos;
unsigned level; /* recursion level */
};
#ifdef CONFIG_DM_VERITY_FEC