tree f04390e54f455155eea0975be5cf9e9ef23552b8
parent e1595d89ae8180e0d3815cc75336ac3484de0aa0
author Mans Rullgard <mans@mansr.com> 1424003629 +0000
committer Stephen Boyd <sboyd@codeaurora.org> 1442442918 -0700

clk: check for invalid parent index of orphans in __clk_init()

If a mux clock is initialised (by hardware or firmware) with an
invalid parent, its ->get_parent() can return an out of range
index.  For example, the generic mux clock attempts to return
-EINVAL, which due to the u8 return type ends up a rather large
number.  Using this index with the parent_names[] array results
in an invalid pointer and (usually) a crash in the following
strcmp().

This patch adds a check for the parent index being in range,
ignoring clocks reporting invalid values.

Signed-off-by: Mans Rullgard <mans@mansr.com>
Tested-by: Rhyland Klein <rklein@nvidia.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>