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dm crypt: replace open-coded kmemdup_nul

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kzalloc() followed by strncpy() on an expected NUL-terminated string is
just kmemdup_nul(). Let's simplify this code (while also dropping a
deprecated strncpy() call [1]).

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
Link: https://github.com/KSPP/linux/issues/90
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Justin Stitt <justinstitt@google.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
This commit is contained in:
Justin Stitt 2023-09-25 06:35:54 +00:00 committed by Mike Snitzer
parent ac4149ba7e
commit e9d7bd2c86
1 changed files with 1 additions and 2 deletions
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3
drivers/md/dm-crypt.c
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@ -2858,10 +2858,9 @@ static int crypt_ctr_auth_cipher(struct crypt_config *cc, char *cipher_api)
if (!start || !end || ++start > end)
return -EINVAL;
mac_alg = kzalloc(end - start + 1, GFP_KERNEL);
mac_alg = kmemdup_nul(start, end - start, GFP_KERNEL);
if (!mac_alg)
return -ENOMEM;
strncpy(mac_alg, start, end - start);
mac = crypto_alloc_ahash(mac_alg, 0, CRYPTO_ALG_ALLOCATES_MEMORY);
kfree(mac_alg);