3.12-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jon Medhurst <t...@linaro.org>
commit b31459adeab018b297541e288ac88873011da82a upstream.
The __do_cache_op function operates with a 'chunk' size of one page
but fails to limit the size of the final chunk so as to not exceed
the specified memory region. Fix this.
Reported-by: Christian Gmeiner <christian.gmei...@gmail.com>
Tested-by: Christian Gmeiner <christian.gmei...@gmail.com>
Acked-by: Will Deacon <will.dea...@arm.com>
Signed-off-by: Jon Medhurst <t...@linaro.org>
Signed-off-by: Russell King <rmk+ker...@arm.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
arch/arm/kernel/traps.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -503,9 +503,10 @@ static inline int
__do_cache_op(unsigned long start, unsigned long end)
{
int ret;
- unsigned long chunk = PAGE_SIZE;
do {
+ unsigned long chunk = min(PAGE_SIZE, end - start);
+
if (signal_pending(current)) {
struct thread_info *ti = current_thread_info();
--
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