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dh_genprime: Fix issue where the error code returned by mbedtls_mpi_write_file() is incorrectly reported on failure

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In 'dh_genprime.c', the following condition can be found inside an 'if' statement:

ret = mbedtls_mpi_write_file( "P = ", &P, 16, fout ) != 0

As the '!=' operator binds closer than the assignment operator ('='), the value assigned to 'ret' will be the boolean result of the comparison (0 or 1) instead of the status code returned by 'mbedtls_mpi_write_file'. This means that the above statement is actually equivalent to:

ret = ( mbedtls_mpi_write_file( "P = ", &P, 16, fout ) != 0 )

What we want instead is for the the status code to be assigned to 'ret'. If the value assigned is non-zero, it will be 'truthy' and the 'if' branch will be taken.

( ret = mbedtls_mpi_write_file( "P = ", &P, 16, fout ) )  != 0

This PR fixes the issue by explicitly specifying the precedence of operations with parentheses.

Signed-off-by: ihsinme <ihsinme@gmail.com>
This commit is contained in:
ihsinme 2022-11-08 14:30:45 +03:00
parent 42d75f2daf
commit d21ecd71c0
1 changed files with 2 additions and 2 deletions
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4
programs/pkey/dh_genprime.c
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@ -157,8 +157,8 @@ int main( int argc, char **argv )
goto exit;
}
if( ( ret = mbedtls_mpi_write_file( "P = ", &P, 16, fout ) != 0 ) ||
( ret = mbedtls_mpi_write_file( "G = ", &G, 16, fout ) != 0 ) )
if( ( ( ret = mbedtls_mpi_write_file( "P = ", &P, 16, fout ) ) != 0 ) ||
( ( ret = mbedtls_mpi_write_file( "G = ", &G, 16, fout ) ) != 0 ) )
{
mbedtls_printf( " failed\n ! mbedtls_mpi_write_file returned %d\n\n", ret );
fclose( fout );