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authorJustin Stitt <justinstitt@google.com>2023-09-27 08:20:58 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2023-10-05 14:34:05 +0300
commit1b6f457b835447a787a729dbd421653f865921d0 (patch)
tree284736fe09adb756d3c3ba98a2800ca6466b3efb /drivers
parent6f17027cc48793b9e6631fe0e52fee1af0e8b7e0 (diff)
downloadlinux-1b6f457b835447a787a729dbd421653f865921d0.tar.xz
c2port: replace deprecated strncpy with strscpy
`strncpy` is deprecated for use on NUL-terminated destination strings [1] and as such we should prefer more robust and less ambiguous string interfaces. We expect `c2dev->name` to be NUL-terminated based on its usage with format strings: | dev_info(c2dev->dev, "C2 port %s removed\n", c2dev->name); Moreover, NUL-padding is _not_ required as c2dev is zero-allocated: | c2dev = kzalloc(sizeof(struct c2port_device), GFP_KERNEL); Considering the above, a suitable replacement is `strscpy` [2] due to the fact that it guarantees NUL-termination on the destination buffer without unnecessarily NUL-padding. Let's also drop `C2PORT_NAME_LEN - 1` for `sizeof(dest)` which is more idiomatic strscpy usage. Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1] Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2] Link: https://github.com/KSPP/linux/issues/90 Cc: linux-hardening@vger.kernel.org Signed-off-by: Justin Stitt <justinstitt@google.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Link: https://lore.kernel.org/r/20230927-strncpy-drivers-misc-c2port-core-c-v1-1-978f6d220a54@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/misc/c2port/core.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/misc/c2port/core.c b/drivers/misc/c2port/core.c
index f574c83b82cf..2bb1dd2511f9 100644
--- a/drivers/misc/c2port/core.c
+++ b/drivers/misc/c2port/core.c
@@ -923,7 +923,7 @@ struct c2port_device *c2port_device_register(char *name,
}
dev_set_drvdata(c2dev->dev, c2dev);
- strncpy(c2dev->name, name, C2PORT_NAME_LEN - 1);
+ strscpy(c2dev->name, name, sizeof(c2dev->name));
c2dev->ops = ops;
mutex_init(&c2dev->mutex);