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Subject[PATCH 08/22] crypto: x86/glue_helper - add check for xts input length equal to zero
Date
From: Andrei Botila <andrei.botila@nxp.com>

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.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrei Botila <andrei.botila@nxp.com>
---
arch/x86/crypto/glue_helper.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/arch/x86/crypto/glue_helper.c b/arch/x86/crypto/glue_helper.c
index d3d91a0abf88..cc5042c72910 100644
--- a/arch/x86/crypto/glue_helper.c
+++ b/arch/x86/crypto/glue_helper.c
@@ -275,6 +275,9 @@ int glue_xts_req_128bit(const struct common_glue_ctx *gctx,
unsigned int nbytes, tail;
int err;

+ if (!req->cryptlen)
+ return 0;
+
if (req->cryptlen < XTS_BLOCK_SIZE)
return -EINVAL;

--
2.17.1
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