[PATCH 4/4] sh: Fix hw_breakpoint the range check

[Frederic Weisbecker]

From: Oleg Nesterov <oleg@xxxxxxxxxx>

arch_check_bp_in_kernelspace() tries to avoid the overflow and does 2
TASK_SIZE checks but it needs OR, not AND. Consider va = TASK_SIZE -1
and len = 2 case.

Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Fixes: 09a072947791088b88ae15111cf68fc5aaaf758d
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
---
 arch/sh/kernel/hw_breakpoint.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/sh/kernel/hw_breakpoint.c b/arch/sh/kernel/hw_breakpoint.c
index f917376..9801674 100644
--- a/arch/sh/kernel/hw_breakpoint.c
+++ b/arch/sh/kernel/hw_breakpoint.c
@@ -132,7 +132,7 @@ int arch_check_bp_in_kernelspace(struct perf_event *bp)
 	va = info->address;
 	len = get_hbp_len(info->len);
 
-	return (va >= TASK_SIZE) && ((va + len - 1) >= TASK_SIZE);
+	return (va >= TASK_SIZE) || ((va + len - 1) >= TASK_SIZE);
 }
 
 int arch_bp_generic_fields(int sh_len, int sh_type,
-- 
1.8.3.1

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