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handle malloc failure and don't proceed when the bios call to

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get parameters passed to malloc fails

Noticed by:	Coverity Prevent analysis tool (malloc failure)
This commit is contained in:
sam 2005-03-29 01:48:21 +00:00
parent fd379eb29a
commit ed1d4fbad5
1 changed files with 7 additions and 1 deletions
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8
sys/i386/i386/bios.c
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@ -568,14 +568,20 @@ pnpbios_identify(driver_t *driver, device_t parent)
args.seg.data.limit = 0xffff;
args.entry = pt->pmentryoffset;
if ((error = bios16(&args, PNP_COUNT_DEVNODES, &ndevs, &bigdev)) || (args.r.eax & 0xff))
if ((error = bios16(&args, PNP_COUNT_DEVNODES, &ndevs, &bigdev)) || (args.r.eax & 0xff)) {
printf("pnpbios: error %d/%x getting device count/size limit\n", error, args.r.eax);
return;
}
ndevs &= 0xff; /* clear high byte garbage */
if (bootverbose)
printf("pnpbios: %d devices, largest %d bytes\n", ndevs, bigdev);
devnodebuf = malloc(bigdev + (sizeof(struct pnp_sysdevargs) - sizeof(struct pnp_sysdev)),
M_DEVBUF, M_NOWAIT);
if (devnodebuf == NULL) {
printf("pnpbios: cannot allocate memory, bailing\n");
return;
}
pda = (struct pnp_sysdevargs *)devnodebuf;
pd = &pda->node;