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Forbid empty mpi_core in test data

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This way static analyzers have a chance of knowing we don't expect the
bignum functions to support empty inputs. As things are, Coverity keeps
complaining about it.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2022-11-09 10:45:15 +01:00
parent 42d75f2daf
commit 0b7e07904e
1 changed files with 5 additions and 1 deletions
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6
tests/src/helpers.c
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@ -357,8 +357,12 @@ int mbedtls_test_read_mpi_core( mbedtls_mpi_uint **pX, size_t *plimbs,
size_t hex_len = strlen( input );
size_t byte_len = ( hex_len + 1 ) / 2;
*plimbs = CHARS_TO_LIMBS( byte_len );
/* A core bignum is not allowed to be empty. Forbid it as test data,
* this way static analyzers have a chance of knowing we don't expect
* the bignum functions to support empty inputs. */
if( *plimbs == 0 )
return( 0 );
return( MBEDTLS_ERR_MPI_BAD_INPUT_DATA );
*pX = mbedtls_calloc( *plimbs, sizeof( **pX ) );
if( *pX == NULL )