nvmet: re-fix tracing strncpy() warning

[ Upstream commit 4ee7ffeb4ce50c80bc4504db6f39b25a2df6bcf4 ]

An earlier patch had tried to address a warning about a string copy with
missing zero termination:

drivers/nvme/target/trace.h:52:3: warning: ‘strncpy’ specified bound 32 equals destination size [-Wstringop-truncation]

The new version causes a different warning with some compiler versions, notably
gcc-9 and gcc-10, and also misses the zero padding that was apparently done
intentionally in the original code:

drivers/nvme/target/trace.h:56:2: error: 'strncpy' specified bound depends on the length of the source argument [-Werror=stringop-overflow=]

Change it to use strscpy_pad() with the original length, which will give
a properly padded and zero-terminated string as well as avoiding the warning.

Fixes: d86481e924a7 ("nvmet: use min of device_path and disk len")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/nvme/target/trace.h b/drivers/nvme/target/trace.h
index 6109b38..155334d 100644 (file)
--- a/drivers/nvme/target/trace.h
+++ b/drivers/nvme/target/trace.h
@@ -53,8 +53,7 @@ static inline void __assign_req_name(char *name, struct nvmet_req *req)
                return;
        }
 
-       strncpy(name, req->ns->device_path,
-               min_t(size_t, DISK_NAME_LEN, strlen(req->ns->device_path)));
+       strscpy_pad(name, req->ns->device_path, DISK_NAME_LEN);
 }
 #endif