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Date: Thu, 23 May 2019 21:07:10 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Helen Koike <helen.koike@...labora.com>, Mike Snitzer <snitzer@...hat.com> Subject: [PATCH 5.1 108/122] dm ioctl: fix hang in early create error condition From: Helen Koike <helen.koike@...labora.com> commit 0f41fcf78849c902ddca564f99a8e23ccfc80333 upstream. The dm_early_create() function (which deals with "dm-mod.create=" kernel command line option) calls dm_hash_insert() who gets an extra reference to the md object. In case of failure, this reference wasn't being released, causing dm_destroy() to hang, thus hanging the whole boot process. Fix this by calling __hash_remove() in the error path. Fixes: 6bbc923dfcf57d ("dm: add support to directly boot to a mapped device") Cc: stable@...r.kernel.org Signed-off-by: Helen Koike <helen.koike@...labora.com> Signed-off-by: Mike Snitzer <snitzer@...hat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/md/dm-ioctl.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) --- a/drivers/md/dm-ioctl.c +++ b/drivers/md/dm-ioctl.c @@ -2069,7 +2069,7 @@ int __init dm_early_create(struct dm_ioc /* alloc table */ r = dm_table_create(&t, get_mode(dmi), dmi->target_count, md); if (r) - goto err_destroy_dm; + goto err_hash_remove; /* add targets */ for (i = 0; i < dmi->target_count; i++) { @@ -2116,6 +2116,10 @@ int __init dm_early_create(struct dm_ioc err_destroy_table: dm_table_destroy(t); +err_hash_remove: + (void) __hash_remove(__get_name_cell(dmi->name)); + /* release reference from __get_name_cell */ + dm_put(md); err_destroy_dm: dm_put(md); dm_destroy(md);
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