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| author | Mikulas Patocka <mpatocka@redhat.com> | 2019-08-23 15:55:26 +0200 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2019-08-23 16:13:12 +0200 |
| commit | 123d87d553e26f67e7be318c97c971b6b5fb1daa (patch) | |
| tree | 874e61dd6809114c3b5186c2d7e0fc25a43b3662 /drivers/md/dm.h | |
| parent | dm table: fix invalid memory accesses with too high sector number (diff) | |
| download | linux-123d87d553e26f67e7be318c97c971b6b5fb1daa.tar.xz linux-123d87d553e26f67e7be318c97c971b6b5fb1daa.zip | |
dm: make dm_table_find_target return NULL
Currently, if we pass too high sector number to dm_table_find_target, it
returns zeroed dm_target structure and callers test if the structure is
zeroed with the macro dm_target_is_valid.
However, returning NULL is common practice to indicate errors.
This patch refactors the dm code, so that dm_table_find_target returns
NULL and its callers test the returned value for NULL. The macro
dm_target_is_valid is deleted. In alloc_targets, we no longer allocate an
extra zeroed target.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/dm.h')
| -rw-r--r-- | drivers/md/dm.h | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/drivers/md/dm.h b/drivers/md/dm.h index 0475673337f3..d7c4f6606b5f 100644 --- a/drivers/md/dm.h +++ b/drivers/md/dm.h @@ -86,11 +86,6 @@ struct target_type *dm_get_immutable_target_type(struct mapped_device *md); int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t); /* - * To check the return value from dm_table_find_target(). - */ -#define dm_target_is_valid(t) ((t)->table) - -/* * To check whether the target type is bio-based or not (request-based). */ #define dm_target_bio_based(t) ((t)->type->map != NULL) |