[PATCH 09/22] crypto: xts - add check for block length equal to zero
From: Andrei Botila <andrei.botila@oss.nxp.com>
Date: 2020-08-07 16:22:19
Also in:
linux-crypto, linux-s390, linuxppc-dev, lkml
Subsystem:
crypto api, the rest · Maintainers:
Herbert Xu, "David S. Miller", Linus Torvalds
From: Andrei Botila <redacted> Standardize the way input lengths equal to 0 are handled in all skcipher algorithms. All the algorithms return 0 for input lengths equal to zero. Signed-off-by: Andrei Botila <redacted> --- crypto/xts.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/crypto/xts.c b/crypto/xts.c
index 3c3ed02c7663..7df68f52fddc 100644
--- a/crypto/xts.c
+++ b/crypto/xts.c@@ -263,6 +263,9 @@ static int xts_encrypt(struct skcipher_request *req) struct skcipher_request *subreq = &rctx->subreq; int err; + if (!req->cryptlen) + return 0; + err = xts_init_crypt(req, xts_encrypt_done) ?: xts_xor_tweak_pre(req, true) ?: crypto_skcipher_encrypt(subreq) ?:
@@ -280,6 +283,9 @@ static int xts_decrypt(struct skcipher_request *req) struct skcipher_request *subreq = &rctx->subreq; int err; + if (!req->cryptlen) + return 0; + err = xts_init_crypt(req, xts_decrypt_done) ?: xts_xor_tweak_pre(req, false) ?: crypto_skcipher_decrypt(subreq) ?:
--
2.17.1
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