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ip/torrent: check piece offset, vlong cast

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This commit is contained in:
cinap_lenrek 2013-10-08 08:12:05 +02:00
parent 3c2b09c9dc
commit 50e3c936fa
1 changed files with 2 additions and 2 deletions
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4
sys/src/cmd/ip/torrent.c
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@ -192,11 +192,11 @@ rwpiece(int wr, int index, uchar *data, int len, int poff)
int n, m;
File *f;
if(len <= 0 || poff >= pieces[index].len)
if(len <= 0 || poff < 0 || poff >= pieces[index].len)
return 0;
if(len+poff > pieces[index].len)
len = pieces[index].len - poff;
off = (vlong)index * blocksize;
off = (vlong)index * (vlong)blocksize;
off += poff;
for(f = files; f; f = f->next)
if((f->off+f->len) > off)