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- fix a 4.6-rc1 bio-based DM 'struct dm_target_io' leak in an error path

Browse Source 
- stable@ fix for DM cache metadata's READ_LOCK macros that were
   incorrectly returning error if the block manager was in read-only
   mode; also cleanup multi-statement macros to use do {} while(0)
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Merge tag 'dm-4.6-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper fixes from Mike Snitzer:

 - fix a 4.6-rc1 bio-based DM 'struct dm_target_io' leak in an error
   path

 - stable@ fix for DM cache metadata's READ_LOCK macros that were
   incorrectly returning error if the block manager was in read-only
   mode; also cleanup multi-statement macros to use do {} while(0)

* tag 'dm-4.6-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm cache metadata: fix READ_LOCK macros and cleanup WRITE_LOCK macros
  dm: fix dm_target_io leak if clone_bio() returns an error
This commit is contained in:
Linus Torvalds 2016-04-14 19:07:45 -07:00
commit 63a1281b65
2 changed files with 43 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

64
drivers/md/dm-cache-metadata.c
View File

@ -867,39 +867,55 @@ static int blocks_are_unmapped_or_clean(struct dm_cache_metadata *cmd,
return 0;
}
#define WRITE_LOCK(cmd) \
down_write(&cmd->root_lock); \
if (cmd->fail_io || dm_bm_is_read_only(cmd->bm)) { \
up_write(&cmd->root_lock); \
return -EINVAL; \
static bool cmd_write_lock(struct dm_cache_metadata *cmd)
{
down_write(&cmd->root_lock);
if (cmd->fail_io || dm_bm_is_read_only(cmd->bm)) {
up_write(&cmd->root_lock);
return false;
}
return true;
}
#define WRITE_LOCK_VOID(cmd) \
down_write(&cmd->root_lock); \
if (cmd->fail_io || dm_bm_is_read_only(cmd->bm)) { \
up_write(&cmd->root_lock); \
return; \
}
#define WRITE_LOCK(cmd) \
do { \
if (!cmd_write_lock((cmd))) \
return -EINVAL; \
} while(0)
#define WRITE_LOCK_VOID(cmd) \
do { \
if (!cmd_write_lock((cmd))) \
return; \
} while(0)
#define WRITE_UNLOCK(cmd) \
up_write(&cmd->root_lock)
up_write(&(cmd)->root_lock)
#define READ_LOCK(cmd) \
down_read(&cmd->root_lock); \
if (cmd->fail_io || dm_bm_is_read_only(cmd->bm)) { \
up_read(&cmd->root_lock); \
return -EINVAL; \
static bool cmd_read_lock(struct dm_cache_metadata *cmd)
{
down_write(&cmd->root_lock);
if (cmd->fail_io) {
up_write(&cmd->root_lock);
return false;
}
return true;
}
#define READ_LOCK_VOID(cmd) \
down_read(&cmd->root_lock); \
if (cmd->fail_io || dm_bm_is_read_only(cmd->bm)) { \
up_read(&cmd->root_lock); \
return; \
}
#define READ_LOCK(cmd) \
do { \
if (!cmd_read_lock((cmd))) \
return -EINVAL; \
} while(0)
#define READ_LOCK_VOID(cmd) \
do { \
if (!cmd_read_lock((cmd))) \
return; \
} while(0)
#define READ_UNLOCK(cmd) \
up_read(&cmd->root_lock)
up_read(&(cmd)->root_lock)
int dm_cache_resize(struct dm_cache_metadata *cmd, dm_cblock_t new_cache_size)
{

4
drivers/md/dm.c
View File

@ -1662,8 +1662,10 @@ static int __clone_and_map_data_bio(struct clone_info *ci, struct dm_target *ti,
tio = alloc_tio(ci, ti, target_bio_nr);
tio->len_ptr = len;
r = clone_bio(tio, bio, sector, *len);
if (r < 0)
if (r < 0) {
free_tio(ci->md, tio);
break;
}
__map_bio(tio);
}