https://github.com/torvalds/linux
Revision 605d9fb9556f8f5fb4566f4df1480f280f308ded authored by Yang Yingliang on 30 January 2023, 12:58:08 UTC, committed by Ulf Hansson on 13 February 2023, 23:06:22 UTC
If sdio_add_func() or sdio_init_func() fails, sdio_remove_func() can
not release the resources, because the sdio function is not presented
in these two cases, it won't call of_node_put() or put_device().

To fix these leaks, make sdio_func_present() only control whether
device_del() needs to be called or not, then always call of_node_put()
and put_device().

In error case in sdio_init_func(), the reference of 'card->dev' is
not get, to avoid redundant put in sdio_free_func_cis(), move the
get_device() to sdio_alloc_func() and put_device() to sdio_release_func(),
it can keep the get/put function be balanced.

Without this patch, while doing fault inject test, it can get the
following leak reports, after this fix, the leak is gone.

unreferenced object 0xffff888112514000 (size 2048):
  comm "kworker/3:2", pid 65, jiffies 4294741614 (age 124.774s)
  hex dump (first 32 bytes):
    00 e0 6f 12 81 88 ff ff 60 58 8d 06 81 88 ff ff  ..o.....`X......
    10 40 51 12 81 88 ff ff 10 40 51 12 81 88 ff ff  .@Q......@Q.....
  backtrace:
    [<000000009e5931da>] kmalloc_trace+0x21/0x110
    [<000000002f839ccb>] mmc_alloc_card+0x38/0xb0 [mmc_core]
    [<0000000004adcbf6>] mmc_sdio_init_card+0xde/0x170 [mmc_core]
    [<000000007538fea0>] mmc_attach_sdio+0xcb/0x1b0 [mmc_core]
    [<00000000d4fdeba7>] mmc_rescan+0x54a/0x640 [mmc_core]

unreferenced object 0xffff888112511000 (size 2048):
  comm "kworker/3:2", pid 65, jiffies 4294741623 (age 124.766s)
  hex dump (first 32 bytes):
    00 40 51 12 81 88 ff ff e0 58 8d 06 81 88 ff ff  .@Q......X......
    10 10 51 12 81 88 ff ff 10 10 51 12 81 88 ff ff  ..Q.......Q.....
  backtrace:
    [<000000009e5931da>] kmalloc_trace+0x21/0x110
    [<00000000fcbe706c>] sdio_alloc_func+0x35/0x100 [mmc_core]
    [<00000000c68f4b50>] mmc_attach_sdio.cold.18+0xb1/0x395 [mmc_core]
    [<00000000d4fdeba7>] mmc_rescan+0x54a/0x640 [mmc_core]

Fixes: 3d10a1ba0d37 ("sdio: fix reference counting in sdio_remove_func()")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20230130125808.3471254-1-yangyingliang@huawei.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
1 parent 6ea6b95
Raw File
Tip revision: 605d9fb9556f8f5fb4566f4df1480f280f308ded authored by Yang Yingliang on 30 January 2023, 12:58:08 UTC
mmc: sdio: fix possible resource leaks in some error paths
Tip revision: 605d9fb
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  - 'mci_for_each_dimm'
  - 'media_device_for_each_entity'
  - 'media_device_for_each_intf'
  - 'media_device_for_each_link'
  - 'media_device_for_each_pad'
  - 'msi_for_each_desc'
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  - 'nla_for_each_attr'
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  - 'pci_bus_for_each_resource'
  - 'pci_doe_for_each_off'
  - 'pcl_for_each_chunk'
  - 'pcl_for_each_segment'
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  - 'perf_config_items__for_each_entry'
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  - 'perf_config_set__for_each_entry'
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  - 'perf_evlist__for_each_entry_reverse'
  - 'perf_evlist__for_each_entry_safe'
  - 'perf_evlist__for_each_evsel'
  - 'perf_evlist__for_each_mmap'
  - 'perf_hpp_list__for_each_format'
  - 'perf_hpp_list__for_each_format_safe'
  - 'perf_hpp_list__for_each_sort_list'
  - 'perf_hpp_list__for_each_sort_list_safe'
  - 'perf_pmu__for_each_hybrid_pmu'
  - 'ping_portaddr_for_each_entry'
  - 'ping_portaddr_for_each_entry_rcu'
  - 'plist_for_each'
  - 'plist_for_each_continue'
  - 'plist_for_each_entry'
  - 'plist_for_each_entry_continue'
  - 'plist_for_each_entry_safe'
  - 'plist_for_each_safe'
  - 'pnp_for_each_card'
  - 'pnp_for_each_dev'
  - 'protocol_for_each_card'
  - 'protocol_for_each_dev'
  - 'queue_for_each_hw_ctx'
  - 'radix_tree_for_each_slot'
  - 'radix_tree_for_each_tagged'
  - 'rb_for_each'
  - 'rbtree_postorder_for_each_entry_safe'
  - 'rdma_for_each_block'
  - 'rdma_for_each_port'
  - 'rdma_umem_for_each_dma_block'
  - 'resort_rb__for_each_entry'
  - 'resource_list_for_each_entry'
  - 'resource_list_for_each_entry_safe'
  - 'rhl_for_each_entry_rcu'
  - 'rhl_for_each_rcu'
  - 'rht_for_each'
  - 'rht_for_each_entry'
  - 'rht_for_each_entry_from'
  - 'rht_for_each_entry_rcu'
  - 'rht_for_each_entry_rcu_from'
  - 'rht_for_each_entry_safe'
  - 'rht_for_each_from'
  - 'rht_for_each_rcu'
  - 'rht_for_each_rcu_from'
  - 'rq_for_each_bvec'
  - 'rq_for_each_segment'
  - 'rq_list_for_each'
  - 'rq_list_for_each_safe'
  - 'scsi_for_each_prot_sg'
  - 'scsi_for_each_sg'
  - 'sctp_for_each_hentry'
  - 'sctp_skb_for_each'
  - 'sec_for_each_insn'
  - 'sec_for_each_insn_continue'
  - 'sec_for_each_insn_from'
  - 'shdma_for_each_chan'
  - 'shost_for_each_device'
  - 'sk_for_each'
  - 'sk_for_each_bound'
  - 'sk_for_each_entry_offset_rcu'
  - 'sk_for_each_from'
  - 'sk_for_each_rcu'
  - 'sk_for_each_safe'
  - 'sk_nulls_for_each'
  - 'sk_nulls_for_each_from'
  - 'sk_nulls_for_each_rcu'
  - 'snd_array_for_each'
  - 'snd_pcm_group_for_each_entry'
  - 'snd_soc_dapm_widget_for_each_path'
  - 'snd_soc_dapm_widget_for_each_path_safe'
  - 'snd_soc_dapm_widget_for_each_sink_path'
  - 'snd_soc_dapm_widget_for_each_source_path'
  - 'strlist__for_each_entry'
  - 'strlist__for_each_entry_safe'
  - 'sym_for_each_insn'
  - 'sym_for_each_insn_continue_reverse'
  - 'symbols__for_each_entry'
  - 'tb_property_for_each'
  - 'tcf_act_for_each_action'
  - 'tcf_exts_for_each_action'
  - 'udp_portaddr_for_each_entry'
  - 'udp_portaddr_for_each_entry_rcu'
  - 'usb_hub_for_each_child'
  - 'v4l2_device_for_each_subdev'
  - 'v4l2_m2m_for_each_dst_buf'
  - 'v4l2_m2m_for_each_dst_buf_safe'
  - 'v4l2_m2m_for_each_src_buf'
  - 'v4l2_m2m_for_each_src_buf_safe'
  - 'virtio_device_for_each_vq'
  - 'while_for_each_ftrace_op'
  - 'xa_for_each'
  - 'xa_for_each_marked'
  - 'xa_for_each_range'
  - 'xa_for_each_start'
  - 'xas_for_each'
  - 'xas_for_each_conflict'
  - 'xas_for_each_marked'
  - 'xbc_array_for_each_value'
  - 'xbc_for_each_key_value'
  - 'xbc_node_for_each_array_value'
  - 'xbc_node_for_each_child'
  - 'xbc_node_for_each_key_value'
  - 'xbc_node_for_each_subkey'
  - 'zorro_for_each_dev'

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