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Krzysztof Kozlowski 6e2628dfad soundwire: stream: fix NULL pointer dereference for multi_link 
commit e199bf52ff upstream.

If bus is marked as multi_link, but number of masters in the stream is
not higher than bus->hw_sync_min_links (bus->multi_link && m_rt_count >=
bus->hw_sync_min_links), bank switching should not happen.  The first
part of do_bank_switch() code properly takes these conditions into
account, but second part (sdw_ml_sync_bank_switch()) relies purely on
bus->multi_link property.  This is not balanced and leads to NULL
pointer dereference:

  Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
  ...
  Call trace:
   wait_for_completion_timeout+0x124/0x1f0
   do_bank_switch+0x370/0x6f8
   sdw_prepare_stream+0x2d0/0x438
   qcom_snd_sdw_prepare+0xa0/0x118
   sm8450_snd_prepare+0x128/0x148
   snd_soc_link_prepare+0x5c/0xe8
   __soc_pcm_prepare+0x28/0x1ec
   dpcm_be_dai_prepare+0x1e0/0x2c0
   dpcm_fe_dai_prepare+0x108/0x28c
   snd_pcm_do_prepare+0x44/0x68
   snd_pcm_action_single+0x54/0xc0
   snd_pcm_action_nonatomic+0xe4/0xec
   snd_pcm_prepare+0xc4/0x114
   snd_pcm_common_ioctl+0x1154/0x1cc0
   snd_pcm_ioctl+0x54/0x74

Fixes: ce6e74d008 ("soundwire: Add support for multi link bank switch")
Cc: stable@vger.kernel.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20231124180136.390621-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-12-20 15:44:36 +01:00
arch MIPS: Loongson64: Enable DMA noncoherent support 2023-12-13 18:27:05 +01:00
block blk-throttle: fix lockdep warning of "cgroup_mutex or RCU read lock required!" 2023-12-20 15:44:31 +01:00
certs
crypto crypto: pcrypt - Fix hungtask for PADATA_RESET 2023-11-28 16:54:51 +00:00
Documentation platform/x86: asus-wmi: Document the dgpu_disable sysfs attribute 2023-12-13 18:27:06 +01:00
drivers soundwire: stream: fix NULL pointer dereference for multi_link 2023-12-20 15:44:36 +01:00
fs fuse: dax: set fc->dax to NULL in fuse_dax_conn_free() 2023-12-20 15:44:30 +01:00
include asm-generic: qspinlock: fix queued_spin_value_unlocked() implementation 2023-12-20 15:44:35 +01:00
init x86/mm: Initialize text poking earlier 2023-08-08 19:57:39 +02:00
io_uring io_uring/af_unix: disable sending io_uring over sockets 2023-12-13 18:27:06 +01:00
ipc ipc/sem: Fix dangling sem_array access in semtimedop race 2022-12-08 11:24:00 +01:00
kernel perf: Fix perf_event_validate_size() lockdep splat 2023-12-20 15:44:36 +01:00
lib parisc: Drop the HP-UX ENOSYM and EREMOTERELEASE error codes 2023-12-08 08:46:12 +01:00
LICENSES
mm mm: kmem: drop __GFP_NOFAIL when allocating objcg vectors 2023-11-28 16:55:01 +00:00
net appletalk: Fix Use-After-Free in atalk_ioctl 2023-12-20 15:44:29 +01:00
samples samples/hw_breakpoint: fix building without module unloading 2023-09-23 11:01:09 +02:00
scripts sign-file: Fix incorrect return values check 2023-12-20 15:44:29 +01:00
security ima: annotate iint mutex to avoid lockdep false positive warnings 2023-12-08 08:46:15 +01:00
sound ALSA: hda/realtek: Apply mute LED quirk for HP15-db 2023-12-20 15:44:30 +01:00
tools tools headers UAPI: Sync linux/perf_event.h with the kernel sources 2023-12-13 18:27:06 +01:00
usr
virt KVM: fix memoryleak in kvm_init() 2023-04-05 11:23:43 +02:00
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MAINTAINERS Remove DECnet support from kernel 2023-06-21 15:45:38 +02:00
Makefile Linux 5.10.204 2023-12-13 18:27:07 +01:00
README

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.