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Benjamin Block 06896c26af scsi: zfcp: Fix memory leak during adapter release by destroying gid_pn_req 
[ Upstream commit b601fa590e ]

When releasing an adapter we don't free the mempool 'gid_pn_req' that is
allocated during the enqueue. This leaks memory:

  unreferenced object 0xd8d29297de700 (size 256):
    comm "(udev-worker)", pid 2105, jiffies 4294945794
    hex dump (first 32 bytes):
      00 00 00 00 de ad 4e ad ff ff ff ff 00 00 00 00  ......N.........
      ff ff ff ff ff ff ff ff 00 0d c4 5f 67 9d 99 e0  ..........._g...
    backtrace (crc 4a5b5da2):
      [<000dc45f64da418c>] kmemleak_alloc+0x6c/0xa0
      [<000dc45f62b430aa>] __kmalloc_cache_node_noprof+0x36a/0x4d0
      [<000dc45f629a535a>] mempool_create_node_noprof+0xaa/0x150
      [<000dc45ee2c065e6>] zfcp_allocate_low_mem_buffers+0x96/0x370 [zfcp]
      [<000dc45ee2c070f8>] zfcp_adapter_enqueue+0x598/0xd40 [zfcp]
      [<000dc45ee2c08eb0>] zfcp_ccw_set_online+0x160/0x210 [zfcp]
      [<000dc45f643d4762>] ccw_device_set_online+0x232/0xd80
      [<000dc45f643d53d4>] online_store_recog_and_online+0x124/0x390
      [<000dc45f643d8238>] online_store+0x298/0x5b0
      [<000dc45f62eb0a04>] kernfs_fop_write_iter+0x2c4/0x480
      [<000dc45f62c81150>] new_sync_write+0x370/0x4b0
      [<000dc45f62c87abe>] vfs_write+0x43e/0x5b0
      [<000dc45f62c87ff4>] ksys_write+0x114/0x1f0
      [<000dc45f621c4a16>] do_syscall+0x2f6/0x430
      [<000dc45f64d9d5d8>] __do_syscall+0xc8/0x1c0
      [<000dc45f64dc2224>] system_call+0x74/0xa0

Fix this by destroying the mempool during the adapter's release.

Fixes: 799b76d09a ("[SCSI] zfcp: Decouple gid_pn requests from erp")
Signed-off-by: Benjamin Block <bblock@linux.ibm.com>
Tested-by: M Nikhil <nikh1092@linux.ibm.com>
Acked-by: M Nikhil <nikh1092@linux.ibm.com>
Reviewed-by: Chinmaya Kajagar <chinmayk@linux.ibm.com>
Reviewed-by: Nihar Panda <niharp@linux.ibm.com>
Link: https://patch.msgid.link/20260720072736.3381816-2-niharp@linux.ibm.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-08-19 17:14:08 +02:00
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README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.