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sys/crypto/ocb: fix max data condition

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Alexandre Abadie 2019-11-06 12:14:05 +01:00
parent d9ca9f3ef2
commit 607aa6fbcd
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GPG Key ID: 1C919A403CAE1405
1 changed files with 1 additions and 2 deletions
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sys/crypto/modes/ocb.c
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@ -319,8 +319,7 @@ int32_t cipher_decrypt_ocb(cipher_t *cipher, uint8_t *auth_data,
uint8_t tag_len, uint8_t *nonce, size_t nonce_len, uint8_t tag_len, uint8_t *nonce, size_t nonce_len,
uint8_t *input, size_t input_len, uint8_t *output) uint8_t *input, size_t input_len, uint8_t *output)
{ {
if (input_len > (uint32_t)(INT32_MAX + tag_len)) {
if (input_len - tag_len > INT32_MAX) {
// We would not be able to return the proper output length for data this long // We would not be able to return the proper output length for data this long
return OCB_ERR_INVALID_DATA_LENGTH; return OCB_ERR_INVALID_DATA_LENGTH;
} }