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Merge pull request #3894 from maroneze/mbedtls-2.7

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Backport 2.7: Fix use of uinitialized memory in ssl_parse_encrypted_pms
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Gilles Peskine 2020-11-18 18:40:56 +01:00 committed by GitHub
parent a337176b42 9fc67f0e14
commit 1562d9c297
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1 changed files with 6 additions and 0 deletions
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6
library/ssl_srv.c
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@ -3393,6 +3393,12 @@ static int ssl_parse_encrypted_pms( mbedtls_ssl_context *ssl,
if( ret != 0 ) if( ret != 0 )
return( ret ); return( ret );
/* In case of a failure in decryption, peer_pmslen may not have been
* initialized, and it is accessed later. The diff will be nonzero anyway,
* but it's better to avoid accessing uninitialized memory in any case.
*/
peer_pmslen = 0;
ret = mbedtls_pk_decrypt( mbedtls_ssl_own_key( ssl ), p, len, ret = mbedtls_pk_decrypt( mbedtls_ssl_own_key( ssl ), p, len,
peer_pms, &peer_pmslen, peer_pms, &peer_pmslen,
sizeof( peer_pms ), sizeof( peer_pms ),