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Fix mutex leak in RSA

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mbedtls_rsa_gen_key() was not freeing the RSA object, and specifically
not freeing the mutex, in some error cases.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2021-02-02 21:06:10 +01:00
parent d7e82ad9bf
commit 22dc2e7a9b
1 changed files with 9 additions and 7 deletions
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16
library/rsa.c
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@ -538,15 +538,15 @@ int mbedtls_rsa_gen_key( mbedtls_rsa_context *ctx,
int ret; int ret;
mbedtls_mpi H, G; mbedtls_mpi H, G;
if( f_rng == NULL || nbits < 128 || exponent < 3 )
return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
if( nbits % 2 )
return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
mbedtls_mpi_init( &H ); mbedtls_mpi_init( &H );
mbedtls_mpi_init( &G ); mbedtls_mpi_init( &G );
if( f_rng == NULL || nbits < 128 || exponent < 3 || nbits % 2 != 0 )
{
ret = MBEDTLS_ERR_RSA_BAD_INPUT_DATA;
goto cleanup;
}
/* /*
* find primes P and Q with Q < P so that: * find primes P and Q with Q < P so that:
* GCD( E, (P-1)*(Q-1) ) == 1 * GCD( E, (P-1)*(Q-1) ) == 1
@ -610,7 +610,9 @@ cleanup:
if( ret != 0 ) if( ret != 0 )
{ {
mbedtls_rsa_free( ctx ); mbedtls_rsa_free( ctx );
return( MBEDTLS_ERR_RSA_KEY_GEN_FAILED + ret ); if( ( -ret & ~0x7f ) == 0 )
ret = MBEDTLS_ERR_RSA_KEY_GEN_FAILED + ret;
return( ret );
} }
return( 0 ); return( 0 );