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crypto: cbc - Remove VLA usage

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In the quest to remove all stack VLA usage from the kernel[1], this
uses the upper bounds on blocksize. Since this is always a cipher
blocksize, use the existing cipher max blocksize.

[1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com

Change-Id: Icd5510d1b12860ffcf91f3c981a7b87515c83c34
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Git-Repo: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Git-Commit: d73d67fbcb94409e0a92952750f162d4eb696e96
Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org>
This commit is contained in:
Kees Cook 2018-08-07 14:18:36 -07:00 committed by Rishabh Bhatnagar
parent e08156eb14
commit 02c739c52d
1 changed files with 1 additions and 1 deletions
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2
include/crypto/cbc.h
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@ -113,7 +113,7 @@ static inline int crypto_cbc_decrypt_inplace(
unsigned int bsize = crypto_skcipher_blocksize(tfm);
unsigned int nbytes = walk->nbytes;
u8 *src = walk->src.virt.addr;
u8 last_iv[bsize];
u8 last_iv[MAX_CIPHER_BLOCKSIZE];
/* Start of the last block. */
src += nbytes - (nbytes & (bsize - 1)) - bsize;