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Nicolin Chen 2b3f30c8ed iommufd: Fix out_fput in iommufd_fault_alloc() 
commit af7f478051 upstream.

As fput() calls the file->f_op->release op, where fault obj and ictx are
getting released, there is no need to release these two after fput() one
more time, which would result in imbalanced refcounts:
  refcount_t: decrement hit 0; leaking memory.
  WARNING: CPU: 48 PID: 2369 at lib/refcount.c:31 refcount_warn_saturate+0x60/0x230
  Call trace:
   refcount_warn_saturate+0x60/0x230 (P)
   refcount_warn_saturate+0x60/0x230 (L)
   iommufd_fault_fops_release+0x9c/0xe0 [iommufd]
  ...
  VFS: Close: file count is 0 (f_op=iommufd_fops [iommufd])
  WARNING: CPU: 48 PID: 2369 at fs/open.c:1507 filp_flush+0x3c/0xf0
  Call trace:
   filp_flush+0x3c/0xf0 (P)
   filp_flush+0x3c/0xf0 (L)
   __arm64_sys_close+0x34/0x98
  ...
  imbalanced put on file reference count
  WARNING: CPU: 48 PID: 2369 at fs/file.c:74 __file_ref_put+0x100/0x138
  Call trace:
   __file_ref_put+0x100/0x138 (P)
   __file_ref_put+0x100/0x138 (L)
   __fput_sync+0x4c/0xd0

Drop those two lines to fix the warnings above.

Cc: stable@vger.kernel.org
Fixes: 07838f7fd5 ("iommufd: Add iommufd fault object")
Link: https://patch.msgid.link/r/b5651beb3a6b1adeef26fffac24607353bf67ba1.1733212723.git.nicolinc@nvidia.com
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2024-12-14 20:03:22 +01:00
arch LoongArch: KVM: Protect kvm_check_requests() with SRCU 2024-12-14 20:03:20 +01:00
block block: don't verify IO lock for freeze/unfreeze in elevator_init_mq() 2024-12-05 14:03:10 +01:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: pcrypt - Call crypto layer directly when padata_do_parallel() return -EBUSY 2024-12-05 14:01:18 +01:00
Documentation dt-bindings: net: fec: add pps channel property 2024-12-09 10:41:11 +01:00
drivers iommufd: Fix out_fput in iommufd_fault_alloc() 2024-12-14 20:03:22 +01:00
fs ksmbd: fix Out-of-Bounds Write in ksmbd_vfs_stream_write 2024-12-14 20:03:21 +01:00
include scatterlist: fix incorrect func name in kernel-doc 2024-12-14 20:03:18 +01:00
init Compiler Attributes: disable __counted_by for clang < 19.1.3 2024-12-05 14:02:45 +01:00
io_uring io_uring: check for overflows in io_pin_pages 2024-12-05 14:02:50 +01:00
ipc ipc: fix memleak if msg_init_ns failed in create_ipc_ns 2024-12-05 14:03:02 +01:00
kernel tracing: Fix cmp_entries_dup() to respect sort() comparison rules 2024-12-14 20:03:21 +01:00
lib maple_tree: refine mas_store_root() on storing NULL 2024-12-09 10:41:01 +01:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm mm/vmalloc: combine all TLB flush operations of KASAN shadow virtual address into one operation 2024-12-09 10:41:08 +01:00
net tcp_bpf: Fix the sk_mem_uncharge logic in tcp_bpf_sendmsg 2024-12-14 20:03:14 +01:00
rust rust: block: fix formatting of kernel::block::mq::request module 2024-12-05 14:02:21 +01:00
samples kfifo: don't include dma-mapping.h in kfifo.h 2024-12-05 14:03:03 +01:00
scripts modpost: remove incorrect code in do_eisa_entry() 2024-12-05 14:03:08 +01:00
security apparmor: test: Fix memory leak for aa_unpack_strdup() 2024-12-05 14:02:46 +01:00
sound ASoC: mediatek: mt8188-mt6359: Remove hardcoded dmic codec 2024-12-14 20:03:18 +01:00
tools bpf: Ensure reg is PTR_TO_STACK in process_iter_arg 2024-12-14 20:03:16 +01:00
usr initramfs: shorten cmd_initfs in usr/Makefile 2024-07-16 01:07:52 +09:00
virt KVM: x86: switch hugepage recovery thread to vhost_task 2024-12-05 14:02:43 +01:00
.clang-format clang-format: Update with v6.11-rc1's for_each macro list 2024-08-02 13:20:31 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore Kbuild updates for v6.12 2024-09-24 13:02:06 -07:00
.mailmap mailmap: add entry for Thorsten Blum 2024-11-07 14:14:59 -08:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Remove self from DSA entry 2024-11-03 12:52:38 -08:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS MAINTAINERS: update location of media main tree 2024-12-05 14:02:42 +01:00
Makefile rust: allow clippy::needless_lifetimes 2024-12-14 20:03:20 +01:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

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 reStructuredText 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.