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Add bounds check before length read

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This commit is contained in:
Krzysztof Stachowiak 2018-03-14 11:31:13 +01:00
parent 5273182a20
commit 7040553a02
1 changed files with 6 additions and 0 deletions
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6
library/ssl_cli.c
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@ -1850,6 +1850,12 @@ static int ssl_parse_server_psk_hint( mbedtls_ssl_context *ssl,
* *
* opaque psk_identity_hint<0..2^16-1>; * opaque psk_identity_hint<0..2^16-1>;
*/ */
if( (*p) > end - 2 )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message "
"(psk_identity_hint length)" ) );
return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
}
len = (*p)[0] << 8 | (*p)[1]; len = (*p)[0] << 8 | (*p)[1];
*p += 2; *p += 2;