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Luis Henriques d19555ff22 virtiofs: fix memory leak in virtio_fs_probe() 
commit c79c5e0178 upstream.

When accidentally passing twice the same tag to qemu, kmemleak ended up
reporting a memory leak in virtiofs.  Also, looking at the log I saw the
following error (that's when I realised the duplicated tag):

  virtiofs: probe of virtio5 failed with error -17

Here's the kmemleak log for reference:

unreferenced object 0xffff888103d47800 (size 1024):
  comm "systemd-udevd", pid 118, jiffies 4294893780 (age 18.340s)
  hex dump (first 32 bytes):
    00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00  .....N..........
    ff ff ff ff ff ff ff ff 80 90 02 a0 ff ff ff ff  ................
  backtrace:
    [<000000000ebb87c1>] virtio_fs_probe+0x171/0x7ae [virtiofs]
    [<00000000f8aca419>] virtio_dev_probe+0x15f/0x210
    [<000000004d6baf3c>] really_probe+0xea/0x430
    [<00000000a6ceeac8>] device_driver_attach+0xa8/0xb0
    [<00000000196f47a7>] __driver_attach+0x98/0x140
    [<000000000b20601d>] bus_for_each_dev+0x7b/0xc0
    [<00000000399c7b7f>] bus_add_driver+0x11b/0x1f0
    [<0000000032b09ba7>] driver_register+0x8f/0xe0
    [<00000000cdd55998>] 0xffffffffa002c013
    [<000000000ea196a2>] do_one_initcall+0x64/0x2e0
    [<0000000008f727ce>] do_init_module+0x5c/0x260
    [<000000003cdedab6>] __do_sys_finit_module+0xb5/0x120
    [<00000000ad2f48c6>] do_syscall_64+0x33/0x40
    [<00000000809526b5>] entry_SYSCALL_64_after_hwframe+0x44/0xae

Cc: stable@vger.kernel.org
Signed-off-by: Luis Henriques <lhenriques@suse.de>
Fixes: a62a8ef9d9 ("virtio-fs: add virtiofs filesystem")
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-05-11 14:47:33 +02:00
arch arm64/vdso: Discard .note.gnu.property sections in vDSO 2021-05-11 14:47:33 +02:00
block block: return -EBUSY when there are open partitions in blkdev_reread_part 2021-04-28 13:39:59 +02:00
certs certs: Fix blacklist flag type confusion 2021-03-04 11:37:59 +01:00
crypto crypto: api - check for ERR pointers in crypto_destroy_tfm() 2021-05-11 14:47:16 +02:00
Documentation dt-bindings: net: ethernet-controller: fix typo in NVMEM 2021-04-14 08:42:12 +02:00
drivers power: supply: cpcap-battery: fix invalid usage of list cursor 2021-05-11 14:47:32 +02:00
fs virtiofs: fix memory leak in virtio_fs_probe() 2021-05-11 14:47:33 +02:00
include perf: Rework perf_event_exit_event() 2021-05-11 14:47:31 +02:00
init init/Kconfig: make COMPILE_TEST depend on HAS_IOMEM 2021-04-10 13:36:11 +02:00
ipc ipc: adjust proc_ipc_sem_dointvec definition to match prototype 2020-09-05 12:14:29 -07:00
kernel sched,psi: Handle potential task count underflow bugs more gracefully 2021-05-11 14:47:31 +02:00
lib dyndbg: fix parsing file query without a line-range suffix 2021-05-11 14:47:11 +02:00
LICENSES LICENSES/deprecated: add Zlib license text 2020-09-16 14:33:49 +02:00
mm mm: ptdump: fix build failure 2021-04-21 13:00:57 +02:00
net net: qrtr: Avoid potential use after free in MHI send 2021-05-07 11:04:31 +02:00
samples samples, bpf: Add missing munmap in xdpsock 2021-03-17 17:06:12 +01:00
scripts kasan: fix hwasan build for gcc 2021-04-28 13:40:02 +02:00
security KEYS: trusted: Fix TPM reservation for seal/unseal 2021-04-28 13:39:59 +02:00
sound ALSA: hda/realtek: Add quirk for Intel Clevo PCx0Dx 2021-05-11 14:47:33 +02:00
tools tools/power/turbostat: Fix turbostat for AMD Zen CPUs 2021-05-11 14:47:33 +02:00
usr Merge branch 'work.fdpic' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-08-07 13:29:39 -07:00
virt KVM: Use kvm_pfn_t for local PFN variable in hva_to_pfn_remapped() 2021-02-26 10:13:01 +01:00
.clang-format RDMA 5.10 pull request 2020-10-17 11:18:18 -07:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: docs: ignore sphinx_*/ directories 2020-09-10 10:44:31 -06:00
.mailmap mailmap: add two more addresses of Uwe Kleine-König 2020-12-06 10:19:07 -08:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Jason Cooper to CREDITS 2020-11-30 10:20:34 +01:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS MAINTAINERS: move the staging subsystem to lists.linux.dev 2021-03-25 09:04:18 +01:00
Makefile Makefile: Move -Wno-unused-but-set-variable out of GCC only block 2021-05-11 14:47:33 +02:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -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 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.