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message/fusion: use struct_size over open coded arithmetic

Message ID 20220216030641.1839422-1-chi.minghao@zte.com.cn (mailing list archive)
State Deferred
Headers show
Series message/fusion: use struct_size over open coded arithmetic | expand

Commit Message

CGEL Feb. 16, 2022, 3:06 a.m. UTC 
From: Minghao Chi (CGEL ZTE) <chi.minghao@zte.com.cn>

Replace zero-length array with flexible-array member and make use
of the struct_size() helper in kzalloc(). For example:

struct fw_event_work {
	...
	u8			retries;
	char			event_data[] __aligned(4);
};

Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes.

Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Minghao Chi (CGEL ZTE) <chi.minghao@zte.com.cn>
---
 drivers/message/fusion/mptsas.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/message/fusion/mptsas.c b/drivers/message/fusion/mptsas.c
index 4acd8f9a48e1..c6fb4fd75434 100644
--- a/drivers/message/fusion/mptsas.c
+++ b/drivers/message/fusion/mptsas.c
@@ -5113,7 +5113,7 @@  mptsas_event_process(MPT_ADAPTER *ioc, EventNotificationReply_t *reply)
 
 	event_data_sz = ((reply->MsgLength * 4) -
 	    offsetof(EventNotificationReply_t, Data));
-	fw_event = kzalloc(sizeof(*fw_event) + event_data_sz, GFP_ATOMIC);
+	fw_event = kzalloc(struct_size(fw_event, event_data, event_data_sz), GFP_ATOMIC);
 	if (!fw_event) {
 		printk(MYIOC_s_WARN_FMT "%s: failed at (line=%d)\n", ioc->name,
 		 __func__, __LINE__);