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Merge remote-tracking branch 'hanno/mpi_read_file_underflow' into development

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* hanno/mpi_read_file_underflow:
  Fix potential stack underflow in mpi_read_file.
This commit is contained in:
Manuel Pégourié-Gonnard 2017-06-08 19:48:03 +02:00
commit db108ac944
3 changed files with 15 additions and 4 deletions
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6
library/bignum.c
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@ -616,11 +616,11 @@ int mbedtls_mpi_read_file( mbedtls_mpi *X, int radix, FILE *fin )
if( slen == sizeof( s ) - 2 )
return( MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL );
if( s[slen - 1] == '\n' ) { slen--; s[slen] = '\0'; }
if( s[slen - 1] == '\r' ) { slen--; s[slen] = '\0'; }
if( slen > 0 && s[slen - 1] == '\n' ) { slen--; s[slen] = '\0'; }
if( slen > 0 && s[slen - 1] == '\r' ) { slen--; s[slen] = '\0'; }
p = s + slen;
while( --p >= s )
while( p-- > s )
if( mpi_get_digit( &d, radix, *p ) != 0 )
break;