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Merge pull request #3027 from gilles-peskine-arm/mpi_copy_shrink-2.16

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Backport 2.16: Improve robustness and testing of mbedtls_mpi_copy
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Manuel Pégourié-Gonnard 2020-02-06 09:52:11 +01:00 • committed by GitHub
commit 8d9b1c471c
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3 changed files with 161 additions and 34 deletions
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5
library/bignum.c
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@ -157,9 +157,10 @@ int mbedtls_mpi_shrink( mbedtls_mpi *X, size_t nblimbs )
if( nblimbs > MBEDTLS_MPI_MAX_LIMBS )
return( MBEDTLS_ERR_MPI_ALLOC_FAILED );
/* Actually resize up in this case */
/* Actually resize up if there are currently fewer than nblimbs limbs. */
if( X->n <= nblimbs )
return( mbedtls_mpi_grow( X, nblimbs ) );
/* After this point, then X->n > nblimbs and in particular X->n > 0. */
for( i = X->n - 1; i > 0; i-- )
if( X->p[i] != 0 )
@ -198,7 +199,7 @@ int mbedtls_mpi_copy( mbedtls_mpi *X, const mbedtls_mpi *Y )
if( X == Y )
return( 0 );
if( Y->p == NULL )
if( Y->n == 0 )
{
mbedtls_mpi_free( X );
return( 0 );