Module: kamailio Branch: master Commit: 181c3cfa266ec5897cc2fdd889d90928f90fcbb8 URL: https://github.com/kamailio/kamailio/commit/181c3cfa266ec5897cc2fdd889d90928...

Author: Daniel-Constantin Mierla miconda@gmail.com Committer: Daniel-Constantin Mierla miconda@gmail.com Date: 2016-03-26T11:18:36+01:00

crypto: safety check for memory allocation and free on error cases

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Modified: modules/crypto/crypto_mod.c

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Diff: https://github.com/kamailio/kamailio/commit/181c3cfa266ec5897cc2fdd889d90928... Patch: https://github.com/kamailio/kamailio/commit/181c3cfa266ec5897cc2fdd889d90928...

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diff --git a/modules/crypto/crypto_mod.c b/modules/crypto/crypto_mod.c index 2517b60..fe16b6d 100644 --- a/modules/crypto/crypto_mod.c +++ b/modules/crypto/crypto_mod.c @@ -360,9 +360,14 @@ unsigned char *crypto_aes_encrypt(EVP_CIPHER_CTX *e, unsigned char *plaintext, int c_len = *len + AES_BLOCK_SIZE - 1, f_len = 0; unsigned char *ciphertext = (unsigned char *)malloc(c_len);

+ if(ciphertext == NULL) { + LM_ERR("no more system memory\n"); + return NULL; + } /* allows reusing of 'e' for multiple encryption cycles */ if(!EVP_EncryptInit_ex(e, NULL, NULL, NULL, NULL)){ LM_ERR("failure in EVP_EncryptInit_ex \n"); + free(ciphertext); return NULL; }

@@ -370,12 +375,14 @@ unsigned char *crypto_aes_encrypt(EVP_CIPHER_CTX *e, unsigned char *plaintext, * generated, *len is the size of plaintext in bytes */ if(!EVP_EncryptUpdate(e, ciphertext, &c_len, plaintext, *len)){ LM_ERR("failure in EVP_EncryptUpdate \n"); + free(ciphertext); return NULL; }

/* update ciphertext with the final remaining bytes */ if(!EVP_EncryptFinal_ex(e, ciphertext+c_len, &f_len)){ LM_ERR("failure in EVP_EncryptFinal_ex \n"); + free(ciphertext); return NULL; }

@@ -393,18 +400,25 @@ unsigned char *crypto_aes_decrypt(EVP_CIPHER_CTX *e, unsigned char *ciphertext, int p_len = *len, f_len = 0; unsigned char *plaintext = (unsigned char *)malloc(p_len);

+ if(plaintext==NULL) { + LM_ERR("no more system memory\n"); + return NULL; + } if(!EVP_DecryptInit_ex(e, NULL, NULL, NULL, NULL)){ LM_ERR("failure in EVP_DecryptInit_ex \n"); + free(plaintext); return NULL; }

if(!EVP_DecryptUpdate(e, plaintext, &p_len, ciphertext, *len)){ LM_ERR("failure in EVP_DecryptUpdate\n"); + free(plaintext); return NULL; }

if(!EVP_DecryptFinal_ex(e, plaintext+p_len, &f_len)){ LM_ERR("failure in EVP_DecryptFinal_ex\n"); + free(plaintext); return NULL; }