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[settings] Allow numeric_setting_value() to handle long setting values

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Allow numeric_setting_value() to handle e.g. the byte sequence

  00:00:00:00:12:34:56:78

by returning -ERANGE only if the value actually overflows the return
type.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2013-08-12 18:23:25 +01:00
parent d105627928
commit 55daa953fb
2 changed files with 10 additions and 4 deletions
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8
src/core/settings.c
View File

@ -862,18 +862,18 @@ static int numeric_setting_value ( int is_signed, const void *raw, size_t len,
const int8_t *signed_bytes = raw;
int is_negative;
unsigned int i;
uint8_t pad;
uint8_t byte;
/* Range check */
if ( len > sizeof ( long ) )
return -ERANGE;
/* Convert to host-ordered longs */
is_negative = ( len && ( signed_bytes[0] < 0 ) );
*value = ( ( is_signed && is_negative ) ? -1L : 0 );
pad = *value;
for ( i = 0 ; i < len ; i++ ) {
byte = unsigned_bytes[i];
*value = ( ( *value << 8 ) | byte );
if ( ( ( i + sizeof ( *value ) ) < len ) && ( byte != pad ) )
return -ERANGE;
}
return len;

6
src/tests/settings_test.c
View File

@ -342,6 +342,12 @@ static void settings_test_exec ( void ) {
RAW ( 0x98, 0xab, 0x41, 0x81 ), 0x98ab4181 );
fetchn_ok ( &test_settings, &test_uint32_setting,
RAW ( 0xff, 0xff, 0xfe ), 0x00fffffe );
fetchn_ok ( &test_settings, &test_uint32_setting,
RAW ( 0, 0, 0, 0x12, 0x34, 0x56, 0x78 ), 0x12345678 );
fetchn_ok ( &test_settings, &test_int32_setting,
RAW ( 0, 0, 0, 0x12, 0x34, 0x56, 0x78 ), 0x12345678 );
fetchn_ok ( &test_settings, &test_int32_setting,
RAW ( 0xff, 0xff, 0x87, 0x65, 0x43, 0x21 ), -0x789abcdf );
/* "hex" setting type */
storef_ok ( &test_settings, &test_hex_setting,