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arcade: fix the buffer overflow.

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This commit is contained in:
sorgelig
2020-04-20 05:57:18 +08:00
parent 077f28c5d8
commit e5ee53afa6
1 changed files with 4 additions and 4 deletions
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8
support/arcade/romutils.cpp
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@@ -191,10 +191,10 @@ static int rom_data(const uint8_t *buf, int chunk, int map, struct MD5Context *m
return 1;
}
extern uint8_t loadbuf[];
static int rom_file(const char *name, uint32_t crc32, int start, int len, int map, struct MD5Context *md5context)
{
fileTYPE f = {};
static uint8_t buf[8192];
if (!FileOpenZip(&f, name, crc32)) return 0;
if (start) FileSeek(&f, start, SEEK_SET);
unsigned long bytes2send = f.size - f.offset;
@@ -202,10 +202,10 @@ static int rom_file(const char *name, uint32_t crc32, int start, int len, int ma
while (bytes2send)
{
uint32_t chunk = (bytes2send > LOADBUF_SZ) ? LOADBUF_SZ : bytes2send;
uint16_t chunk = (bytes2send > sizeof(buf)) ? sizeof(buf) : bytes2send;
FileReadAdv(&f, loadbuf, chunk);
if (!rom_data(loadbuf, chunk, map, md5context))
FileReadAdv(&f, buf, chunk);
if (!rom_data(buf, chunk, map, md5context))
{
FileClose(&f);
return 0;