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misc: c2port: core: Make copying name from userspace more secure

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Currently the 'c2dev' device data is not initialised when it's
allocated.  There maybe an issue when using strncpy() to populate the
'name' attribute since a NUL terminator may not be provided in all
use-cases.  To prevent such a failing, let's ensure the 'c2dev'
device data area is fully zeroed out on allocation.

Cc: Rodolfo Giometti <giometti@enneenne.com>
Cc: "Eurotech S.p.A" <info@eurotech.it>
Cc: David Laight <David.Laight@aculab.com>
Reported-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20201102142001.560490-1-lee.jones@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lee Jones 2020-11-02 14:20:00 +00:00 committed by Greg Kroah-Hartman
parent c78c95f919
commit e8f50d4bfc
1 changed files with 1 additions and 1 deletions
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2
drivers/misc/c2port/core.c
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@ -899,7 +899,7 @@ struct c2port_device *c2port_device_register(char *name,
unlikely(!ops->c2d_get) || unlikely(!ops->c2d_set))
return ERR_PTR(-EINVAL);
c2dev = kmalloc(sizeof(struct c2port_device), GFP_KERNEL);
c2dev = kzalloc(sizeof(struct c2port_device), GFP_KERNEL);
if (unlikely(!c2dev))
return ERR_PTR(-ENOMEM);