Skip to content

L
linux
Switch branch/tag
  1. 15 Jan, 2019 4 commits
    • Silvio Cesare's avatar
      ASoC: dapm: change snprintf to scnprintf for possible overflow · e581e151
      Silvio Cesare authored 
      Change snprintf to scnprintf. There are generally two cases where using
snprintf causes problems.

1) Uses of size += snprintf(buf, SIZE - size, fmt, ...)
In this case, if snprintf would have written more characters than what the
buffer size (SIZE) is, then size will end up larger than SIZE. In later
uses of snprintf, SIZE - size will result in a negative number, leading
to problems. Note that size might already be too large by using
size = snprintf before the code reaches a case of size += snprintf.

2) If size is ultimately used as a length parameter for a copy back to user
space, then it will potentially allow for a buffer overflow and information
disclosure when size is greater than SIZE. When the size is used to index
the buffer directly, we can have memory corruption. This also means when
size = snprintf... is used, it may also cause problems since size may become
large.  Copying to userspace is mitigated by the HARDENED_USERCOPY kernel
configuration.

The solution to these issues is to use scnprintf which returns the number of
characters actually written to the buffer, so the size variable will never
exceed SIZE.
Signed-off-by: default avatarSilvio Cesare <silvio.cesare@gmail.com>
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: default avatarWilly Tarreau <w@1wt.eu>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
      e581e151
    • Shuming Fan's avatar
      ASoC: rt5682: Fix PLL source register definitions · ee7ea2a9
      Shuming Fan authored 
      Fix typo which causes headphone no sound while using BCLK
as PLL source.
Signed-off-by: default avatarShuming Fan <shumingf@realtek.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
      ee7ea2a9
    • Matthias Reichl's avatar
      ASoC: core: Don't defer probe on optional, NULL components · 2833548e
      Matthias Reichl authored 
      cpu and platform are optional components in DAI links. For example
codec-codec links usually have no platform set.

Call snd_soc_find_component only if the name or of_node of
a cpu or platform is set. Otherwise it will return NULL and
soc_init_dai_link bails out immediately with -EPROBE_DEFER,
meaning registering a card with NULL cpu or platform in DAI links
can never succeed.

Fixes: 8780cf11 ("ASoC: soc-core: defer card probe until all component is added to list")
Signed-off-by: default avatarMatthias Reichl <hias@horus.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
      2833548e
    • Mark Brown's avatar
      ASoC: core: Make snd_soc_find_component() more robust · 5a7b2aab
      Mark Brown authored 
      There are some use cases where you're checking for a lot of things on a
card and it makes sense that you might end up trying to call
snd_soc_find_component() without either a name or an of_node.  Currently
in that case we try to dereference the name and crash but it's more
useful to allow the caller to just treat that as a case where we don't
find anything, that error handling will already exist.

Inspired by a patch from Ajit Pandey fixing some callers.

Fixes: 8780cf11 ("ASoC: soc-core: defer card probe until all component is added to list")
Reported-by: default avatarPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
      5a7b2aab
  3. 14 Jan, 2019 1 commit
    • Curtis Malainey's avatar
      ASoC: soc-core: fix init platform memory handling · 09ac6a81
      Curtis Malainey authored 
      snd_soc_init_platform initializes pointers to snd_soc_dai_link which is
statically allocated and it does this by devm_kzalloc. In the event of
an EPROBE_DEFER the memory will be freed and the pointers are left
dangling. snd_soc_init_platform sees the dangling pointers and assumes
they are pointing to initialized memory and does not reallocate them on
the second probe attempt which results in a use after free bug since
devm has freed the memory from the first probe attempt.

Since the intention for snd_soc_dai_link->platform is that it can be set
statically by the machine driver we need to respect the pointer in the
event we did not set it but still catch dangling pointers. The solution
is to add a flag to track whether the pointer was dynamically allocated
or not.
Signed-off-by: default avatarCurtis Malainey <cujomalainey@chromium.org>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
      09ac6a81
  5. 10 Jan, 2019 1 commit
  7. 09 Jan, 2019 2 commits
  9. 07 Jan, 2019 2 commits
  11. 04 Jan, 2019 2 commits
  13. 03 Jan, 2019 12 commits
  15. 18 Dec, 2018 11 commits
  17. 16 Dec, 2018 1 commit
  19. 14 Dec, 2018 4 commits
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7