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Fix bug in ssl_write_supported_elliptic_curves_ext

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Passing invalid curves to mbedtls_ssl_conf_curves caused a crash later
in ssl_write_supported_elliptic_curves_ext. #373
This commit is contained in:
Janos Follath 2016-02-22 11:20:56 +00:00
parent 365b226a56
commit db8b089cdc
2 changed files with 8 additions and 1 deletions
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2
ChangeLog
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@ -9,6 +9,8 @@ Bugfix
* Fix issue in Makefile that prevented building using armar. #386 * Fix issue in Makefile that prevented building using armar. #386
* Fix bug in mbedtls_x509_crt_parse that caused trailing extra data in the * Fix bug in mbedtls_x509_crt_parse that caused trailing extra data in the
buffer after DER certificates to be included in the raw representation. buffer after DER certificates to be included in the raw representation.
* Fix issue that caused a crash if invalid curves were passed to
mbedtls_ssl_conf_curves. #373
Changes Changes
* On ARM platforms, when compiling with -O0 with GCC, Clang or armcc5, * On ARM platforms, when compiling with -O0 with GCC, Clang or armcc5,

7
library/ssl_cli.c
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@ -269,6 +269,12 @@ static void ssl_write_supported_elliptic_curves_ext( mbedtls_ssl_context *ssl,
for( info = mbedtls_ecp_curve_list(); info->grp_id != MBEDTLS_ECP_DP_NONE; info++ ) for( info = mbedtls_ecp_curve_list(); info->grp_id != MBEDTLS_ECP_DP_NONE; info++ )
{ {
#endif #endif
if( info == NULL )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid curve in ssl configuration" ) );
return;
}
elliptic_curve_len += 2; elliptic_curve_len += 2;
} }
@ -288,7 +294,6 @@ static void ssl_write_supported_elliptic_curves_ext( mbedtls_ssl_context *ssl,
for( info = mbedtls_ecp_curve_list(); info->grp_id != MBEDTLS_ECP_DP_NONE; info++ ) for( info = mbedtls_ecp_curve_list(); info->grp_id != MBEDTLS_ECP_DP_NONE; info++ )
{ {
#endif #endif
elliptic_curve_list[elliptic_curve_len++] = info->tls_id >> 8; elliptic_curve_list[elliptic_curve_len++] = info->tls_id >> 8;
elliptic_curve_list[elliptic_curve_len++] = info->tls_id & 0xFF; elliptic_curve_list[elliptic_curve_len++] = info->tls_id & 0xFF;
} }