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Don't use more than 32 MB of the content data to compute the hash

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This commit is contained in:
Andre Leiradella 2017-05-07 19:46:22 +01:00
parent 844d1475e6
commit 7404abf938
1 changed files with 24 additions and 4 deletions
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28
cheevos/cheevos.c
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@ -92,6 +92,10 @@
#define CHEEVOS_JSON_KEY_MEM 0x0b8807e4U
#define CHEEVOS_JSON_KEY_FORMAT 0xb341208eU
#define CHEEVOS_SIX_MB ( 6 * 1024 * 1024)
#define CHEEVOS_EIGHT_MB ( 8 * 1024 * 1024)
#define CHEEVOS_SIZE_LIMIT (32 * 1024 * 1024)
enum
{
/* Don't change those, the values match the console IDs
@ -2704,9 +2708,6 @@ static int cheevos_deactivate_unlocks(unsigned game_id, retro_time_t *timeout)
#endif
}
#define CHEEVOS_SIX_MB (6 * 1024 * 1024)
#define CHEEVOS_EIGHT_MB (8 * 1024 * 1024)
static INLINE unsigned cheevos_next_power_of_2(unsigned n)
{
n--;
@ -2736,6 +2737,11 @@ static size_t cheevos_eval_md5(
if (info->size - offset < max_size)
max_size = info->size - offset;
#ifdef CHEEVOS_SIZE_LIMIT
if (max_size > CHEEVOS_SIZE_LIMIT)
max_size = CHEEVOS_SIZE_LIMIT;
#endif
MD5_Update(ctx, (void*)((uint8_t*)info->data + offset), max_size);
return max_size;
}
@ -2746,8 +2752,22 @@ static size_t cheevos_eval_md5(
if (!file)
return 0;
size = filestream_get_size(file);
if (max_size == 0)
max_size = size;
if (size - offset < max_size)
max_size = size - offset;
#ifdef CHEEVOS_SIZE_LIMIT
if (max_size > CHEEVOS_SIZE_LIMIT)
max_size = CHEEVOS_SIZE_LIMIT;
#endif
filestream_seek(file, offset, SEEK_SET);
size = 0;
for (;;)
{
@ -2755,7 +2775,7 @@ static size_t cheevos_eval_md5(
ssize_t num_read;
size_t to_read = sizeof(buffer);
if (max_size != 0 && to_read > max_size)
if (to_read > max_size)
to_read = max_size;
num_read = filestream_read(file, (void*)buffer, to_read);