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Add check for iv_off in AES-CFB128 and AES-OFB

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The check is mandatory as skipping it results in buffer overread of arbitrary
size.
This commit is contained in:
Manuel Pégourié-Gonnard 2018-12-18 10:03:30 +01:00
parent 998a358529
commit 5b89c09273
1 changed files with 6 additions and 0 deletions
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6
library/aes.c
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@ -1298,6 +1298,9 @@ int mbedtls_aes_crypt_cfb128( mbedtls_aes_context *ctx,
n = *iv_off;
if( n > 16 )
return( MBEDTLS_ERR_AES_BAD_INPUT_DATA );
if( mode == MBEDTLS_AES_DECRYPT )
{
while( length-- )
@ -1391,6 +1394,9 @@ int mbedtls_aes_crypt_ofb( mbedtls_aes_context *ctx,
n = *iv_off;
if( n > 16 )
return( MBEDTLS_ERR_AES_BAD_INPUT_DATA );
while( length-- )
{
if( n == 0 )