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firmware: xilinx: fix out-of-bounds access

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The zynqmp_pm_set_suspend_mode() and zynqmp_pm_get_trustzone_version()
functions pass values as api_id into zynqmp_pm_invoke_fn
that are beyond PM_API_MAX, resulting in an out-of-bounds access:

drivers/firmware/xilinx/zynqmp.c: In function 'zynqmp_pm_set_suspend_mode':
drivers/firmware/xilinx/zynqmp.c:150:24: warning: array subscript 2562 is above array bounds of 'u32[64]' {aka 'unsigned int[64]'} [-Warray-bounds]
  150 |  if (zynqmp_pm_features[api_id] != PM_FEATURE_UNCHECKED)
      |      ~~~~~~~~~~~~~~~~~~^~~~~~~~
drivers/firmware/xilinx/zynqmp.c:28:12: note: while referencing 'zynqmp_pm_features'
   28 | static u32 zynqmp_pm_features[PM_API_MAX];
      |            ^~~~~~~~~~~~~~~~~~

Replace the resulting undefined behavior with an error return.
This may break some things that happen to work at the moment
but seems better than randomly overwriting kernel data.

I assume we need additional fixes for the two functions that now
return an error.

Fixes: 76582671eb ("firmware: xilinx: Add Zynqmp firmware driver")
Fixes: e178df31cf ("firmware: xilinx: Implement ZynqMP power management APIs")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20201026155449.3703142-1-arnd@kernel.org
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Arnd Bergmann 2020-10-26 16:54:36 +01:00 committed by Greg Kroah-Hartman
parent d9109fe0f3
commit f3217d6f2f
1 changed files with 3 additions and 0 deletions
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3
drivers/firmware/xilinx/zynqmp.c
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@ -147,6 +147,9 @@ static int zynqmp_pm_feature(u32 api_id)
return 0;
/* Return value if feature is already checked */
if (api_id > ARRAY_SIZE(zynqmp_pm_features))
return PM_FEATURE_INVALID;
if (zynqmp_pm_features[api_id] != PM_FEATURE_UNCHECKED)
return zynqmp_pm_features[api_id];