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EVP_*Update: ensure that input NULL with length 0 isn't passed #8676

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EVP_*Update: ensure that input NULL with length 0 isn't passed #8676

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c9d4e49
EVP_*Update: ensure that input NULL with length 0 isn't passed
levitte Apr 4, 2019
412b31b
fixup! EVP_*Update: ensure that input NULL with length 0 isn't passed
levitte Apr 5, 2019
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12 changes: 12 additions & 0 deletions crypto/evp/evp_enc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -306,6 +306,12 @@ static int evp_EncryptDecryptUpdate(EVP_CIPHER_CTX *ctx,
bl = ctx->cipher->block_size;

if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
/* Prevent accidental "final" call */
if (inl <= 0 && in == NULL) {
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*outl = 0;
return inl == 0;
}

/* If block size > 1 then the cipher will have to do this check */
if (bl == 1 && is_partially_overlapping(out, in, cmpl)) {
EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
Expand Down Expand Up @@ -458,6 +464,12 @@ int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
cmpl = (cmpl + 7) / 8;

if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
/* Prevent accidental "final" call */
if (inl <= 0 && in == NULL) {
*outl = 0;
return inl == 0;
}

if (b == 1 && is_partially_overlapping(out, in, cmpl)) {
EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
return 0;
Expand Down