[PATCH] platform/x86: think-lmi: Prevent underflow in index_store()

[Dan Carpenter <dan.carpenter@oracle.com>]

There needs to be a check to prevent negative offsets for
setting->index.  I have reviewed this code and I think that the
"if (block->instance_count <= instance)" check in __query_block() will
prevent this from resulting in an out of bounds access.  But it's
still worth fixing.

Fixes: 640a5fa50a42 ("platform/x86: think-lmi: Opcode support")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
 drivers/platform/x86/think-lmi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/platform/x86/think-lmi.c b/drivers/platform/x86/think-lmi.c
index 27ab8e4e5b83..0b73e16cccea 100644
--- a/drivers/platform/x86/think-lmi.c
+++ b/drivers/platform/x86/think-lmi.c
@@ -573,7 +573,7 @@ static ssize_t index_store(struct kobject *kobj,
 	if (err < 0)
 		return err;
 
-	if (val > TLMI_INDEX_MAX)
+	if (val < 0 || val > TLMI_INDEX_MAX)
 		return -EINVAL;
 
 	setting->index = val;
-- 
2.20.1