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Fix DEADCODE in mbedtls_mpi_exp_mod()

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In mbedtls_mpi_exp_mod(), the limit check on wsize is never true when
MBEDTLS_MPI_WINDOW_SIZE is at least 6. Wrap in a preprocessor guard
to remove the dead code and resolve a Coverity finding from the
DEADCODE checker.

Change-Id: Ice7739031a9e8249283a04de11150565b613ae89
This commit is contained in:
Peter Kolbus 2018-12-11 14:01:44 -06:00
parent f352f75f6b
commit e6bcad3f79
1 changed files with 2 additions and 0 deletions
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2
library/bignum.c
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@ -1869,8 +1869,10 @@ int mbedtls_mpi_exp_mod( mbedtls_mpi *X, const mbedtls_mpi *A,
wsize = ( i > 671 ) ? 6 : ( i > 239 ) ? 5 : wsize = ( i > 671 ) ? 6 : ( i > 239 ) ? 5 :
( i > 79 ) ? 4 : ( i > 23 ) ? 3 : 1; ( i > 79 ) ? 4 : ( i > 23 ) ? 3 : 1;
#if( MBEDTLS_MPI_WINDOW_SIZE < 6 )
if( wsize > MBEDTLS_MPI_WINDOW_SIZE ) if( wsize > MBEDTLS_MPI_WINDOW_SIZE )
wsize = MBEDTLS_MPI_WINDOW_SIZE; wsize = MBEDTLS_MPI_WINDOW_SIZE;
#endif
j = N->n + 1; j = N->n + 1;
MBEDTLS_MPI_CHK( mbedtls_mpi_grow( X, j ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_grow( X, j ) );