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Constrain the amount of data returned to what is actually available

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not the size of the buffer.

Approved by:	grehan (co-mentor)
This commit is contained in:
tychon 2014-04-09 14:50:55 +00:00
parent 8fe02cef86
commit 28bb12a94c
1 changed files with 5 additions and 3 deletions
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8
usr.sbin/bhyve/pci_ahci.c
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@ -543,12 +543,14 @@ write_prdt(struct ahci_port *p, int slot, uint8_t *cfis,
for (i = 0; i < hdr->prdtl && len; i++) {
uint8_t *ptr;
uint32_t dbcsz;
int sublen;
dbcsz = (prdt->dbc & DBCMASK) + 1;
ptr = paddr_guest2host(ahci_ctx(p->pr_sc), prdt->dba, dbcsz);
memcpy(ptr, from, dbcsz);
len -= dbcsz;
from += dbcsz;
sublen = len < dbcsz ? len : dbcsz;
memcpy(ptr, from, sublen);
len -= sublen;
from += sublen;
prdt++;
}
hdr->prdbc = size - len;