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authorBarry Song <barry.song@analog.com>2009-09-16 04:36:29 +0000
committerMike Frysinger <vapier@gentoo.org>2009-12-15 00:13:46 -0500
commit89e84eeace5924f29a4f8f25cce9fcb083969974 (patch)
tree95f2471d436918a2673c2a636594ea6c119210a5 /arch/blackfin/kernel/bfin_gpio.c
parent298571249a1990cd3c6c6ab40250a4a9c18ab5d1 (diff)
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>
Diffstat (limited to 'arch/blackfin/kernel/bfin_gpio.c')
-rw-r--r--arch/blackfin/kernel/bfin_gpio.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/blackfin/kernel/bfin_gpio.c b/arch/blackfin/kernel/bfin_gpio.c
index 22705eeff34..c4161e03df7 100644
--- a/arch/blackfin/kernel/bfin_gpio.c
+++ b/arch/blackfin/kernel/bfin_gpio.c
@@ -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