linux-kernel - [PATCH 2/2] nvme: trace: avoid memcpy overflow warning

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Date: Wed,  3 Jan 2024 16:56:56 +0100
From: Arnd Bergmann <arnd@...nel.org>
To: Christoph Hellwig <hch@....de>,
	Sagi Grimberg <sagi@...mberg.me>,
	Chaitanya Kulkarni <kch@...dia.com>,
	Keith Busch <kbusch@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>,
	linux-nvme@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] nvme: trace: avoid memcpy overflow warning

From: Arnd Bergmann <arnd@...db.de>

A previous patch introduced a struct_group() in nvme_common_command to help
stringop fortification figure out the length of the fields, but one function
is not currently using them:

In file included from drivers/nvme/target/core.c:7:
In file included from include/linux/string.h:254:
include/linux/fortify-string.h:592:4: error: call to '__read_overflow2_field' declared with 'warning' attribute: detected read beyond size of field (2nd parameter); maybe use struct_group()? [-Werror,-Wattribute-warning]
                        __read_overflow2_field(q_size_field, size);
                        ^

Change this one to use the correct field name to avoid the warning.

Fixes: 5c629dc9609dc ("nvme: use struct group for generic command dwords")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/nvme/target/trace.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/nvme/target/trace.h b/drivers/nvme/target/trace.h
index 155334ddc13f..dbb911fd502d 100644
--- a/drivers/nvme/target/trace.h
+++ b/drivers/nvme/target/trace.h
@@ -84,8 +84,7 @@ TRACE_EVENT(nvmet_req_init,
 		__entry->flags = cmd->common.flags;
 		__entry->nsid = le32_to_cpu(cmd->common.nsid);
 		__entry->metadata = le64_to_cpu(cmd->common.metadata);
-		memcpy(__entry->cdw10, &cmd->common.cdw10,
-			sizeof(__entry->cdw10));
+		memcpy(__entry->cdw10, &cmd->common.cdws, sizeof(__entry->cdw10));
 	),
 	TP_printk("nvmet%s: %sqid=%d, cmdid=%u, nsid=%u, flags=%#x, "
 		  "meta=%#llx, cmd=(%s, %s)",
-- 
2.39.2