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Blackfin: add some bounds checking to peripheral_request 

The requested peripheral is turned into an index into some state arrays,
so make sure the calculated index doesn't exceed the index.  This occurs
when using bogus pin values or the define headers are screwed up.  Now
we'll notice right away that something needs fixing instead of trying to
track down random memory corruption.

Signed-off-by: Barry Song <barry.song@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Barry Song 2009-09-16 04:36:29 +00:00 committed by Mike Frysinger
parent 298571249a
commit 89e84eeace
1 changed files with 2 additions and 0 deletions
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2
arch/blackfin/kernel/bfin_gpio.c
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@ -762,6 +762,8 @@ int peripheral_request(unsigned short per, const char *label)
if (!(per & P_DEFINED))
return -ENODEV;
BUG_ON(ident >= MAX_RESOURCES);
local_irq_save_hw(flags);
/* If a pin can be muxed as either GPIO or peripheral, make